The filenames are OK as they work fine in the "New Gallery" dialogue, just not the "Open Gallery" when I go back to one I created earlier. (I also have simplified the names to be sure to just numbers, like "01.jpg".)
I run Mac OS 10.6.8 and JBPRO 1.2.0. I can't actually find the Air app but I had just upgraded it, per the auto dialogue box. I also just de-installed it and downloaded version 3.6 and reinstalled it. Still can't find where the Adobe Air program resides on my computer (looked in Applications and did a filename search), not sure where it resides, but things it requires work fine! (I did just find an exe file named "airappinstaller" with v3.6 buried in an Adobe file folder in my apps.)
With the new Air installed, the "Open Gallery" thumbs still don't show up--same ones do in the "New Gallery" set up. I went to your link for Air 3.3 and it comes up with a missing page message--not Adobe's but a Firefox generic.
Thanks,