A Different Sort of Kefka Hack

My PM box is full, and due to an issue I can't seem to actually delete any of my PMs.

Sorry I did not took the time to look into that. However I've set the max number of pms for regular users to 300 recently (previously 200). Are you saying you already capped the 300? or maybe your setting are overrated by the moderator group you're in an the limit is still at 200...