Armstrong: something similar, but not as bad, happens to me: I cannot run Flashpoint with my original CD [but the original CD DOES work when I run O2Light and the O2 Viewer ....]. So, I CAN preview the model while working on it, but when I want to test it, I must change to the Resistance CD and run Flashpoint Resistance, use its Mission Editor, and test my model. I dunno if this really helps you, but it might help others who faced my particular problem.... Sorry to hear about your GOTY problems. Do you think the problem might be a path name? See if your folders are named the exact same as the folders that the O2 setup tips tell us we should have ... if not, try temporarily renaming your folders? Just an idea.