Well, actually, with this configuration you shouldn't have any problems. The rendering should be fast (performance is acceptable even in my old Celeron 300 with ATI Rage Fury) and without problems. Try to run the program to other harware, or try to open a different map from DOOM.WAD. Or maybe you have an old DOOM version... (DOOM1 tested only with version 1.9 Untimate, and I 've just made a test with shareware (DOOM1.WAD) version 1.9 too).
Anyway, I haven't test the program with ATI Radeon series, but I don't think that this is the problem.
Anyway, I don't believe this program is not bug free, but 2 days ago I made a major test: loading all 36 MAPS of Ultimate DOOM and all 32 MAPS of DOOM2 without exiting the program and I didn't had any crashes or rendering problems.
I'm working on this project by now, so just look for an update...
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