To give a little bit of history: a big item for our OpenLP 1.9.6 (Beta 2) release was to fix the JPEG support on Snow Leopard (OS X 10.6), not just on Leopard (OS X 10.5) - see this ticket. But it turns out that was not that easy to fix, as during packaging OpenLP it somehow get left out. For packaging we are using PyInstaller which does support packaging for OS X, but in this particular case the libraries were not being packaged correctly. Because of this bug in PyInstaller, fixing this issue was delayed until after the official release date of Beta 2. Kudos goes to Martin for fixing that issue:
Now that the official fix is available, we have repacakged OpenLP for OS X, and made it available as OpenLP 220.127.116.11, a special release for Snow Leopard (OS X 10.6) with JPEG support. This now enables users of Snow Leopard to use the JPEG format in images and theme backgrounds. Here's a direct download link:
To answer a recent question about OS X 10.7, aka Lion: unfortunately at this point in time we cannot estimate when OpenLP will be officially supported on Lion (OS X 10.7). Currently the GUI toolkit we use (Qt) has some glitches on that new version of OS X that need to be fixed before we can create an official OpenLP package for Lion. But as you can see, we are working on it!