I recently upgraded to 2.5.1 and am having a problem with displaying categories on the category pages. See http://twelveblackmonkeys.com/category/books. If you look at the pulldown list, it shows there are 38 entries in that category, but when I go to this page, it says that nothing was found. I tried chaning themes, but that didn't help. I looked at category settings, but I'm not seeing anything relevant. This happens with all my categories...
Wait, just went through all my categories and my photos and gadgets & technology categories get redirected to single posts! What's up with that?? Neither of these categories look any different from the others.
I haven't customized the category permalinks or the categories themselves other than adding names and descriptions. None of my categories have parents.
Any help would be greatly appreciated, thanks!