I just wanted to play w/ ut3 on dm/tdm servers and got this error message:
I think the problem is some installed mutator, but yesterday night everything were ok and nothing changed since then, only practised combos offline. I've got installed the following mutators:
utcompIII v4 beta2
utcomp ping compensation
talking Icon mutator
CBP3 Pickups
and some .u .upk .ini file manually because of i couldnt play the videos made by demorec.