Possibly related? history-forum-t354.html
I noticed in the unofficial redmarx hip-hop thread that I couldn't edit or delete posts, and by chance I stumbled upon the above linked thread -- although unlike the situation S.Arty described, the mod control panel is actually accessible (which means I can merge and split topics, etc.); the problem here is deleting and editing posts using either the standard in-line tools in the mod arsenal (such as warning posters and viewing post information, which are now the only available options), or using the mod CP. I am also unable to delete topics from the mod CP. As far as I can tell, this problem only extends to the Site management*, Music, Current Events, and Occupy Wall Street forums/subforums.
*for some reason the Suggestions sub-forum remains unaffected