If you use OpenGL for you UT driver and have crash issues, try the latest drivers for D3D an follow the instructions (courtesy http://www.cwdohnal.com/utglr/ ) to change your video driver under the Options tab – Options/Preferences/Video Driver
Direct3D9 renderer version 1.3 for UT: utd3d9r13.zip (107 KB).
Direct3D9 renderer version 1.2 for UT: utd3d9r12.zip (102 KB).
It’s a couple new files that go in the UnrealTournamentSystem directory. To use it, change video drivers in UT, select show all devices, and then select Direct3D9 Support. If the OpenGL renderer doesn’t work right on your system for whatever reason (video driver problems or some other issue), you can try using this one instead. It has mostly the same feature set as the updated OpenGL renderer. Note that this Direct3D9 renderer doesn’t support selection in the editor, so consider it unsupported and not fully functional as far as use with the editor is concerned.
It has made a big difference for me and have not crashed since using it.