I am posting this on behalf of Mike, who is having the following problem:
"Whenever I use OpenGL I will get a black screen every couple of game starts. Sometimes it works, sometimes it doesn't."
Because of above, he has to use software mode. He runs Vista, and has an ATI Radeon X1300 Pro, 256mb VRAM. He says the drivers are current on it, as he talked to someone on uDogs about it before and they gave him site to download the new drivers as they thought that was the issue, but it didn't change the problem.
I had Mike register on here so if there's some stuff you need him to check, like posting his Myth Log, he can respond.