Let’s see if we can get this puppy to roll over.
edit: Success! Darned Google Sitemaps plugin b0rked things. I’ll probably upgrade the plugin version to a version that works with recent WordPress versions, but I don’t guarantee it. I may also edit that sentence to seem less redundant with its redundant use of redundant instances of “versions” redundantly, but that’s even less likely.
Of course, since youse guys don’t really see the plugin’s benefits with your own eyes, this is pretty much useless information for you as readers. If you’re having a “wp_post2cat doesn’t exist” problem of your own, though, maybe this’ll help you fix some problems on your WordPress installs.