You don't say what video card or driver you are using, but this is the body of a message I wrote to our VAR in August. Might be the same thing for you.
WT
ATI FireGL X2 AGP Pro video card
I have been running the driver version 6.14.10.6483, dated 10/20/04 since Dec/04 with no apparent problems. As I was attempting to discover the cause of the orientation box issue, I updated to the latest driver from the SW site, which installed 6.14.10.6521, dated
2/26/05. I ran that for 2 days when all of a sudden, upon starting SW last night, I was informed that SW had turned on the Software OGL setting. Quite strange, I thought, and so set out to figure out why. After wasting half a day with trying everything, including, but not limited to, swapping the card with another one, upgrading the driver to the latest on the ATI site, reloading SW, etc. I finally figured out that going back to the 6483 driver would fix it!
So, it would appear that the latest & greatest drivers are actually causing a problem. I checked another machine here that is running the same card with the 6521 driver, and his Software OGL is checked!
One thing I noticed about the 2 newest drivers that I tried is that there wasn't any way to select SW as the desired OGL settings. I found this as strange, but maybe that's just the way it had to be. Now I'm not so sure....