On vbulletin 3 theres a bug in the pm system that wont let you PM people who have upercase charactors in there username. I tryed it on my board and a stock vb3. When you try to pm somone it just says that the user does not exist.
Anyone have a fix for this? My thread at vbulletin.com was pretty much ignored.
Are you sure? The username system is not case sensitive, so typing in all lower case has always worked for me.