That sounds odd.
If neither AIR (the platform on which JuiceboxBuilder-Pro runs) nor JuiceboxBuilder-Pro itself have changed, then I'm really not sure why the functionality of the application should have changed.
An OS upgrade could prevent JuiceboxBuilder-Pro from running (we've seen that before with the need to use Rosetta, for example) but, assuming the application runs OK, then I would expect it to work OK, too.
What exactly happens (or does not happen) when you drag and drop an image onto the drag and drop area on the images panel? Does anything happen at all? Does the image processing progress bar appear? Does the new image appear in the thumbnail grid but not in the gallery itself?
Have you tried adding an image via the 'Browse...' button instead of dragging and dropping? Do you get the same results?
Have you tried adding images from different sources to see if maybe the images themselves are causing a problem?
Could you please also try with JuiceboxBuilder-Lite to see if the same thing happens?
I expect the same thing will happen (JuiceboxBuilder-Lite and JuiceboxBuilder-Pro share a lot of the same code) but it might help to troubleshoot the problem (to see if there is perhaps something wrong with your JuiceboxBuilder-Pro installation).
You can download JuiceboxBuilder-Lite from our download page here.
(JuiceboxBuilder-Lite and JuiceboxBuilder-Pro can both be installed and run on the same computer at the same time.)
Have you tried temporarily turning off any security software that you might have installed in case this is somehow interfering with JuiceboxBuilder-Pro's functionality? In the past, aggressive real-time protection from AVG, Avast and Norton has been known to cause problems. (There are no known problems at present, though.)
(Please turn off any security software at your own risk and make sure that you disconnect from the internet first.)
Finally, please confirm the version numbers of JuicboxBuilder-Pro and AIR that you are currently using. It might help to know which versions you are using. Thank you.
Sorry for all the questions. I'm just trying to figure out what's going on as I don't have access to a Mac running Sonora.
Unfortunately, I don't have a quick fix for this (no-one else has reported this problem and I cannot replicate it myself) but maybe with a little more information, we can work through this.