Apple Mail can't delete emails or move them to folders
I moved to Apple Mail from Outlook about a year ago, and have found it a bit clunky, but it works well enough. I make extensive use of folders to keep my inbox clean and sort mail into client or subject-relevant mailboxes. Over the last month, Mail will work well enough when I first open it, but now after only a few minutes it will stop deleting emails (it moves on to the next email, but leaves the one I tried to delete in the inbox) and it will not allow me to drag messages into mailboxes.
I have deleted all of my 6 email accounts from mail and reinstalled only 1 this morning, and the same problem remains.
Any thoughts as to what may be happening and how to fix it? I'm about ready to go back to Outlook (reluctantly).
Mail-OTHER, OS X Mountain Lion (10.8.2)