Problem Deleting PMs

I keep getting this message when I try to delete my messages:

Invalid Private Message specified. If you followed a valid link, please notify the administrator

And, when I select *administrator* and fill-in the reason...I get another message saying that I can't send the message to the *admin* because I need to enter a title and subject.

Help please.

Have yo tried cleaning out your cache, cookies and temporary Internet file areas?

A great free program for that is CCleaner