Some people were mentioning in the threads that after installing Th3ory Shift3r 2.3.x, once they went into Market -> My Apps, there would be no apps listed or some would be missing. I had the exact same problem, and I was able to hunt down a fix for this problem on the interwebs, so I thought I would share in case it helps anyone else out.
That links is for Archos tablets, but the fix worked perfectly for my on my Bionic. One thing to mention is that once you follow the directions on that site, reboot your phone BEFORE trying to open up the Market app again. Otherwise you will have to repeat the process.
Hope this helps some of you guys! Enjoy.