Sounds like graphics rendering issues. What are your system specs?
motherboard & cpu
ammount of ram
video card(s) sli or crossfire (if applicable) and current drivers and any video enhancement software you might be using like nHancer for Nvidia cards or ATI tool for ATI cards.
OS and version.
It may help to sort out your issues.
But if it worked fine on a clean boot up then progressively gets worse, it sounds like it may be driver related or something like that. If you've got the latest drivers for your video card(s) try going back to an older version to see if it helps.
It used to drive me madd in the older days. To play EAW, and Red Baron 3D I had to use one set of drivers. If I wanted to play Rowan's Battle of Britain, I had to load a different set of drivers as the video was all messed up otherwise. Same thing for the other 2 games. It was just the way the driver versions renderred the video.
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