Sorry for the delay- been busy. It really sounds like you have some kind of third party addon that's causing this issue. XGUI directly calls console commands, so, does it work if you run "ulx ban name 20 rdm", or "ulx kick name" from the console? If it's ONLY happening when you use the chat commands "!kick" or "!ban", then I'm pretty sure this issue has nothing to do with ULX. Try temporarily removing all of your other addons AND modules (dll files) so only ULX/ULib remain, then add your addons back in one at a time until the issue starts happening again.