I had a lot of problems with Unreal before (read this for more info) and can't really get UT2004 to work in DirectX without problems. I edited the UT2004 ini to make UT2004 run in OpenGL. Now UT2004 works well. As far as I know, this doesn't include the editor. Any help? This is really f.... stupid. I can't run UT2004+Editor at the same time without crashing my PC!