Found the problem, it was the ClaimLink Plugin, a parter of mine installed the plugin then uninstalled it, then he found that when he uninstalled it, it really does not uninstall fully. It leaves a claimlink table and def file and who knows what else, so he deleted both of them, this caused the delete function to stop working.

Reinstalled ClaimLink, then uninstalled, delete function works agains.

Warning this plugin DOES NOT WORK!

That being said, how do you remove the files without everthing getting screw up?