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.