I think I may know why this is happening, but I don't feel like doing a full nandroid reinstall and losing my data before I ask. I'm getting "incompatible update" errors when trying to reinstall Facebook and Mixzing. Now, I had those apps installed and working on my previous ERE25 based ROM, however, I was at the time using the Dark 24K theme, which modified them. When I went to ESE53, I didn't nandroid, I just used update.zip, and that of course reinstalled the stock theme, which may be causing the problem. It's not showing those two apps in my installed apps list. When I check them in the market, they show "installed", but I am able to redownload and reinstall them, I just get the error during install. I used root explorer and tried to find the files for those two apps, but they don't seem to be anywhere. Anybody else run into this problem or know of a solution, or should I just do a nandroid restore of the full ROM?