I recently upgraded my blog to WordPress 2.9.2, but ever since I've been unable to remove tags or categories from posts when editing them. When I click on the "Update" button, the tags and categories simply reappear when the page reloads.
I've tried disabling all of my plugins but that didn't help, so now I want to completely remove and reinstall them.
How do I completely remove YARPP? I see that it creates two database tables and adds entries to some of the default WordPress tables. Which of these are safe to delete?