Is UT2004 a later version than what they used to make RC? cuz if it is, the RC editor probably can't handle whatever new features there are.
I know that this is probably(even most likely) a stupid question and you probably(again even most likely) made sure u got a version that is compatible with RC, but this is all i can think of.
I know that this is probably(even most likely) a stupid question and you probably(again even most likely) made sure u got a version that is compatible with RC, but this is all i can think of.