I have a 9250 128MB and seem to be having a similar problem, when i put the details on low sometimes in missions I cant even see my buildings or my units except for my infantry. I had a 9200se 128MB before this and i played reasonably on low detail and 1024*768, this tells me that it is the drivers. I have tried the original ones that come with the card, the Omega, and now im about to try the catalyst control center.