Garvin told me he has fixed the issue already and is bundleing a new fix/release. Let's give him a few days to bundle the stuff. We shouldn't forget, it's still weekend.
Okay...I realize that this thread is ancient. Still, the problem with autosaving existing entires still seems to exist. It saves new entries, with existing entries it doesn't work. At leat not here. :)
Go to the Plugins section on your admin page. Open the Category plugin preferences.
To disable the rss image enter 'none' into the 'XML-Button' text field. To disable the checkboxes choose 'no' in the '...display multiple categories...' section.
Sorry for the long delay. But..... I fell asleep, lol. Of course I'll try to update my installation. But something tells me that it doesn't really solve the problem since beta1 => beta2 only seemed to be a quick fix release for the sql exploid thingy.