You can download the latest version of WP-Juicebox (v1.5.0) from the plugin's support page here. (WP-Juicebox is not included in the Juicebox-Pro zip package.)
Install the plugin following the Installation Instructions (in the link above) and upgrade it to Juicebox-Pro (using the 'jbcore' folder from your Juicebox-Pro v1.5.0 zip package) by following the Upgrading to Juicebox-Pro instructions.

Essentially:
(1) Download WP-Juicebox v1.5.0.
(2) Replace the plugin's 'jbcore' folder with the one from your Juicebox-Pro v1.5.0 zip package.
(3) Upload the 'wp-juicebox' folder to your WordPress 'wp-content/plugins/' directory, overwriting your existing 'wp-juicebox' folder.

After doing this, you will have the latest version of both WP-Juicebox and Juicebox-Pro.

It looks like the problem is with your Picasa User Id and/or Picasa Album Name.

Check that the functionality is working OK by setting up a test gallery with the following information:
Picasa User Id: picasateam
Picasa Album Name: VegasWeekend

Please check your Picasa User Id. It may not be your email address.
Also, as Google have discontinued Picasa and are moving all Picasa web albums over to Google+ photo albums, you might need to enter Google credentials rather than Picasa ones.

You can find your Google User Id by logging in to Google+ and clicking the 'Google+ Profile' link above the 'My Account' button (after clicking your custom image at the top right). Your Google User Id will be the 21 digit number in the URL (in your browser's address bar).

Take a look at this forum thread which should hopefully point you in the right direction towards finding your Google Album Id (a 19 digit number).

I hope this helps.

You're welcome.
I'm glad you've got it working.

PHP 5.4.35.

Have you tried my 3 suggestions above yet to see if any of them make a difference?

Creating Juicebox galleries with WP-Juicebox v1.5.0 and NextGEN v2.1.43 seems to work OK on my own server with WordPress 4.5.2 (and PHP 5.4.35) so the problem may somehow be related to your own setup (your current theme, activated plugins, PHP version, server settings).

Unfortunately, as I am currently unable to replicate the problem, it makes troubleshooting quite difficult.

I would certainly try reverting to a default WordPress theme and deactivating all plugins (including all CDN and caching plugins) other that WP-Juicebox and NextGEN to see if this helps.

The captionPosition in this gallery is BELOW_IMAGE.
The Info Button only toggles elements positioned on the overlay (captionPosition="OVERLAY" or captionPosition="OVERLAY_IMAGE").
When captionPosition is BELOW_IMAGE, BOTTOM or BELOW_THUMBS, the captions will always be visible (and not toggled via the Info Button).

When I go directly to http://fotoslubna.com/wp-content/plugin … lery_id=55 in a browser, I see the complete XML data.

Are you using a Content Delivery Network or any server side caching?
Try temporarily disabling any CDN and caching plugins to see if this makes a difference.

The problem is that your gallery files are not in the correct location on your web server.
According to the embedding code on your 'new616.html' page, your gallery's 'juicebox.js' file should be located here: http://www.annabrahms.com/jbcore/juicebox.js
However, going directly to that location in a browser results in an error 404 (file not found).

If you are following the regular embedding instructions here, then you'll need to copy the contents of your gallery folder into the same directory as the web page containing the embedding code (in your case, your root directory, alongside the 'new616.html' page).

If you have already uploaded the complete gallery folder to your web server somewhere, then you can use the baseUrl method of embedding as documented here.

If you continue to experience difficulties, please let me know where on your web server your gallery files are and I should be able to help with what embedding code to use.

So far, I have been unable to replicate the problem you have reported.

I successfully created a Juicebox gallery using WP-Juicebox v1.5.0, sourced by NextGEN v2.1.23.
I then upgraded NextGEN to v2.1.43 and the gallery still displayed fine.
I then downgraded WP-Juicebox to v1.4.4.2 and created a new gallery, sourced by NextGEN v2.1.43.
Again, the gallery displayed fine.
I then upgraded WP-Juicebox to v1.5.0 and, once again, the gallery displayed fine.

At the moment, I am unsure what might be causing your problem.

The problem could possibly be due to a JavaScript conflict between the v1.5.0 'juicebox.js' file and another JavaScript file on your page (a JavaScript file that is not being loaded in my own test pages).

To help track down the cause of the problem, please try the following:

(1) Try temporarily reverting to a default WordPress theme (such as Twenty Sixteen) to see if this helps.
(2) Try temporarily deactivating all plugins other than WP-Juicebox and NextGEN to see if this helps. If it does, then reactivate the plugins, one by one (checking your Juicebox gallery after each one), until you find the source of the conflict.
(3) Try using WP-Juicebox v1.4.4.2 with the Juicebox-Pro v1.5.0 'jbcore' folder and also try using WP-Juicebox v1.5.0 with the Juicebox-Pro v1.4.4.2 'jbcore' folder. This should help to determine whether the problem is related to the WP-Juicebox code or the core Juicebox-Pro code.

Each time you check your gallery after trying the suggestions above, please refresh your browser's cache to ensure that your browser is not using old files.

Unfortunately, as I am unable to replicate the problem (it seems to be unique to your own WordPress setup or server), I cannot try these suggestions myself.

Hopefully this will help to point us in the right direction.

Can you please provide a URL to a gallery page which exhibits this problem so that I can take a look.
Also, please let me know what image source you are using (Media Library, Flickr Account, NextGEN Gallery, Picasa Web Album) so that I can try to replicate the problem myself.
Thank you.

Edit:
I've just created sample galleries with WP-Juicebox v1.5.0 (using Media Library, Flickr Account and Picasa Web Album sources) and they all display OK for me.
Once I can see your own gallery's web page, I should be able to investigate further.

Juicebox officially supports "Internet Explorer 7+, Firefox 3.6+, Chrome, Safari and Opera." (as noted in the System Requirements).

I notice that there is one line of code in the 'theme.css' file which is noted to be "For IE 5.5 - 7" so it'll be there for IE7 support.
There should no no code specifically for versions of IE below IE7 (and very little code specifically for versions below IE11).

Maybe it is time to leave IE7 behind (it certainly doesn't have a large market share any more) but removing the IE7-specific code would not reduce the overall size of the Juicebox core files by much.
The developers have likely opted to retain IE7 support (at least for the time being) as removing support would save only a KB or two.

According to this report, IE8 still has a 6.21% market share (May 2016) so it might not yet be time to remove support for IE8.

If you like, you could post your suggestion in the Feature Requests thread.
This keeps all the ideas together and ensures that they are not overlooked by the developers.
Thank you.

As I mentioned in my last email, you could perhaps try using Time Machine to wind your computer back to a time before the problems began (or at least were evident). This might help.
Also, if you can target and fix the other problem you mentioned (regarding safe mode), then this might also help. The safe mode and JuiceboxBuilder-Pro problems might somehow be related.