I'm glad that you've been able to resolve your problem and that all is well.
Thank you for posting back to let me know. It's most appreciated.
I hope everything runs a little more smoothly for you in the future!

I'm sorry to hear that you are having trouble with JuiceboxBuilder-Pro.
I hope that my suggestions below help you to resolve your problem.

Suggestion #1

The most likely cause of unresponsive 'New Gallery...' and 'Open Gallery...' buttons is a persistent '.tempGallery' folder.
JuiceboxBuilder-Pro creates a temporary folder (named '.tempGallery') whilst a gallery is being created or edited. This folder is automatically deleted on closing JuiceboxBuilder-Pro.
However, if for any reason JuiceboxBuilder-Pro is unable to delete the '.tempGallery' folder on closing the application, then the "New Gallery..." and "Open Gallery..." buttons may become unresponsive the next time the program is used.

The most likely cause of a persistent '.tempGallery' folder is the use of an online synced file-sharing folder so we do not recommend saving a gallery to (or opening a gallery from) a folder being synced to an online file-sharing service such as Dropbox or Google Drive.
On a Windows system, the '.tempGallery' folder is located here:
Windows: C:\Users\Username\Documents\JuiceboxBuilder-Pro\.tempGallery

I'm not sure where the '.tempGallery' folder would be on a Mac but if you search for '.tempGallery', you should hopefully find it (if it exists).

With JuiceboxBuilder-Pro closed, please check to see if your own system has a '.tempGallery' folder in this location and, if so, manually delete it before re-opening JuiceboxBuilder-Pro.

Even if you do not save or load a gallery from a synced folder, if the location of the '.tempGallery' folder is being synced (e.g. the 'Documents' folder on a Windows system), then problems might occur so it's worth checking this suggestion out if you use an online file-sharing service at all.

Suggestion #2

If you have any third-party anti-virus or security software installed, then please try temporarily disabling it (including real-time protection and ransomware detection) in case it is somehow interfering with JuiceboxBuilder-Pro's functionality.
(Please do so at your own risk and be sure to disconnect from the internet first.)
If you find that your security software is interfering with JuiceboxBuilder-Pro's functionality, then hopefully you'll be able to make an exception for JuiceboxBuilder-Pro in your security software's whitelist.

Suggestion #3

The problem could be caused by corrupt data in the Encrypted Local Store (ELS) folder. Clearing this data may help.
With JuiceboxBuilder-Pro closed, please delete the following folder manually before restarting JuiceboxBulder-Pro.
Windows: C:\Users\Username\AppData\Roaming\Adobe\AIR\ELS\JuiceboxBuilder-Pro
Mac: /Users/Username/Library/Application Support/Adobe/AIR/ELS/JuiceboxBuilder-Pro

Suggestion #4

If none of the suggestions above help, then I'd recommend completely uninstalling and and then reinstalling both AIR and JuiceboxBuilder-Pro (taking the opportunity to ensure that both programs are up to date).
The full uninstall/reinstall procedure is documented as #11 in this forum post.

You can download the latest version of AIR (v33.1.1.533) from Harman's website here.
I have sent you a new download link for your Juicebox-Pro (Single Site License) purchase (in a separate email which you should hopefully have received by now) so that you can download the latest version of JuiceboxBuilder-Pro (v1.5.1).

Suggestion #5

Maybe the problem is somehow related to administrative rights.
Is the user account you log into on your laptop an administrator account?  If not, try logging in as an administrator.

Suggestion #6
The only other thing I can think of that has caused problems with JuiceboxBuilder-Pro in the past is a corrupt user profile.
Such an issue usually manifests itself in other ways (not the symptoms you describe) but the workaround is worth a shot to see if it resolves your problem.
Try creating a new administrator user on your system and install AIR and JuiceboxBuilder-Pro user this new user account.

I hope that my suggestions above help.
Please let me know how you get on.
Thank you.

If I check the available sizes for the 2nd and 3rd images in your gallery (which are not displayed in your gallery) in the Flickr flickr.photos.getSizes API Explorer, I see that the only sizes available are Square, Large Square, Thumbnail, Small and Small 320; no regular Medium, Large or Original sizes are listed (the Large Square size only has dimensions of 150 x 150).

Juicebox-Pro can display only Medium, Large or Original size images and, unfortunately, your small images have none of these sizes available.
I expect that if you select Original as the Flickr Image Size but there is no Original size available, Juicebox-Pro will fall back to the Large Size (and failing that, will fall back to the Medium size). However, being that none of the three usable sizes is available, then the image does not display.

The 1st and 4th images in your gallery (which are displayed in your gallery) do not have an Original size but they do have a Medium size and a Large size.

Just for a point of reference, I checked one of my own Flickr images and the available sizes are: Square, Large Square, Thumbnail, Small, Small 320, Small 400, Medium, Medium 640, Medium 800, Large, Large 1600, Large 2048, Original.

Unfortunately, there's no way to modify Juicebox to display other sizes so the only solution would be to upload larger images to Flickr and ensure that there is at least a Medium size available.

Please double-check that you have uploaded your Pro 'jbore' folder to the correct location on your web server (overwriting the stock Lite 'jbcore' folder in the plugins/WP-Juicebox/ folder).
There is only one 'jbcore' folder that is used for WP-Juicebox and all its galleries so, as long as the Pro 'jbcore' folder is in the correct location, all galleries have no option but to be Pro (as there will be no Lite files anywhere that could possibly be used).
WP-Juicebox - Upgrading to Juicebox-Pro: https://www.juicebox.net/support/wp-juicebox/#pro

If this does not resolve your problem, try clearing your browser's cache in case your browser has somehow cached and is using older Lite files from a previous version of your website.

Please let me know how you get on and if I can be of any further assistance.
Thank you.

That's very odd (that you're able to install and use JuiceboxBuilder-Pro v1.5.0 but not v1.5.1).
I'm not sure what could be causing this problem.

Maybe some other M1 Big Sur users can chime in and help further...

In the meantime, you can upgrade your v1.5.0 galleries to v1.5.1 by just swapping the gallery's v1.5.0 'jbcore' folder with the v1.5.1 version from the Juicebox-Pro v1.5.1 zip file ('juicebox_pro_1.5.1/web/jbcore').

Thankfully, there were very few changes to JuiceboxBuilder-Pro between v1.5.0. and v1.5.1 (check out the entries labelled 'JBB' in the Version History); most of the changes were to the Juicebox engine itself, so using JuiceboxBuilder-Pro to generate a v1.5.0 gallery and then upgrading the gallery to v1.5.1 (by replacing its 'jbcore' folder) should be a pretty good workaround.
I hope its not too much of an inconvenience.

Perhaps a search through Harman's AIR discussions or issues might prove useful. You might find other M1 Big Sur users who are experiencing similar issues with different AIR applications.

Please keep me posted with any developments.
Thank you.

Check out the 'Encrypted Local Store' known issue on Harman's AIR Runtimes download page: https://airsdk.harman.com/runtime

JuiceboxBuilder-Pro does use the ELS feature of AIR so you might need to do the following (only once). (Quote copied from Harman's web page, link above.)

I hope this helps.

However, a web search for "The operation can’t be completed because you don’t have the necessary permission." seems to suggest that this error message is generated by the Mac OS rather than AIR or JuiceboxBuilder-Pro so maybe trying one of the online solutions for this error might help, too.

If you do not want the URL to display the #, set enableDirectLinks="FALSE" (in JuiceboxBuilder-Pro's 'Customize -> General' section).
FALSE is the default value for this configuration option, as seen here but your gallery currently sets enableDirectLinks="TRUE".

Incidentally, when setting enableDirectLinks="FALSE", you can still link to a specific image via a # in a URL (for example in an <a> tag) but the URL will not automatically display the # when the gallery is viewed (unless the gallery is viewed via a link with a #).

There is a problem with your gallery's 'config.xml' file.
There is a control character (not a regular text character) in the middle of the image title for the 16th image in your gallery ("14 - Potion fb.jpg").
If you view your gallery's 'config.xml' file directly in a browser (https://maelys-tremblay.fr/Galerie/inkt … config.xml), the browser will let you know at what point in the file the error occurs (Line Number 167, Column 41).
In Firefox, when I view your gallery's 'config.xml' file, I see the following (if there were no errors, you'd see the code for the whole file).

The control character is a STX (start of text) character but I do not know how it got in there (maybe you copied and pasted the image title from another source?).

In any case, if you delete the image title for image #16 ("14 - Potion fb.jpg") and enter it again (just type it in this time rather than copying and pasting from the original source), then all should be well.

Please let me know how you get on and if I can be of any further assistance.
Thank you.

@chris.jones-gill

Thanks so much for documenting and sharing this!

I've mentioned using a function to load galleries into tabs before (it's no doubt buried somewhere deep within the forum in a years-old thread) but not in this detail and not with specific reference to Bootstrap v5.1 so this is very useful.

I hope it helps other users in a similar situation.

Thanks again!

We do not offer (and have never offered) a trial of Juicebox-Pro so I'm not sure where you are getting this information.
However, we do offer a money-back guarantee. Please see the FAQ below.
FAQ: Can I try a trial version of Juicebox-Pro?

You are free to download and use Juicebox-Lite (the free version) for as long as you like. Juicebox-Lite does not have all the features that Juicebox-Pro has (please see the comparison table on the Download Page) but your Juicebox-Lite galleries will never expire.

If, having created galleries with Juicebox-Lite, you choose to purchase Juicebox-Pro, you can upgrade Lite galleries to Pro by following the instructions on the Upgrading Juicebox support page.

I hope this helps to clarify things.
Please let me know if you have any further queries.
Thank you.

You can download the latest version of WP-Juicebox (v1.5.1.4) from the plugin's own support page here.
Here is a direct link to WP-Juicebox v1.5.1.4.

The version history page is here.

With reference to the points you mentioned:
(1) The 'Create Gallery' button was added to the Manage Galleries page in WP-Juicebox v1.5.1.1.
(2) WP-Juicebox v1.5.1.3 fixed a bug whereby the 'Add Juicebox Gallery' button did not display for the Gutenberg editor in WordPress 5.6.
(3) WP-Juicebox v1.5.1.4 fixed a bug whereby the 'Add Gallery' button did not work for the Classic editor (the gallery shortcode was not added to the page/post in the 'Visual' input mode).

With this in mind, if you use WP-Juicebox v1.5.1.4, you should be able to use Gutenberg or the Classic editor (and you'll have the 'Create Gallery' button as a backup if you run into any problems).
The Classic editor is no longer bundled with WordPress but you can download it as a separate plugin from its download page here. It is still maintained by the WordPress team.

Please note that WP-Juicebox comes bundled with Juicebox-Lite (the free version), so don't forget to upgrade the plugin to use you Juicebox-Pro files by following the 'Upgrading to Juicebox-Pro' instructions here.

Please let me know how you get on and if I can be of any further assistance.
Thank you.

That's very strange indeed.

... juicebox id's have diappeared and also the nextgen images no longer seem to exist...

That sounds like two separate issues which may or may not be connected.
I see no reason why any of your Juicebox gallery shortcodes would just disappear (or, indeed, why your NextGEN Gallery images would disappear) unless something has happened on your web server and your web host has maybe had to reinstate your site from an old or incomplete backup.
Please check in with your web host to see if they have made any changes or have experienced any problems recently.
Even if they have not done anything themselves, it might be an idea to ask if they have a backup of your site that could be used to reinstate your galleries.

Could you please point me towards one of your Juicebox gallery pages so that I can inspect the code and investigate further?
Even though the gallery may not be working or displaying images, examining the page might hold a clue as to the nature of the problem.
Thank you.

... or have the galleries themselves completely disappeared from the Manage Galleries page? I don't see how this could happen without clicking the 'Delete All Data' button and clicking through the "Are you sure you want to delete all galleries, custom default values and options?" warning (or by manually deleting the contents of the 'wp-uploads/juicebox/' folder).

Have you updated the NextGEN Gallery plugin lately? Maybe they have changed something lately which has broken the interaction between WP-Juicebox and itself (although this might not explain missing images).
If so, try reverting to an older version of NextGEN Gallery, at least for testing purposes, to see if this resolves the issue.

There has been no change to the NextGEN Gallery integration code within WP-Juicebox for a while now (since v1.4.3.1, 10 releases ago) so upgrading WP-Juicebox should not make a difference in this regard.

Once I am able to see one of your Juicebox gallery pages on your web server, I should hopefully have a better idea of what might be causing your problem.
In the meantime, checking in with your web host to see if they have changed anything recently relating to your site might hold a clue, too.