Well then that makes CLoD already 900 years old "in computer terms". DX10 is no spring chicken either.
Everyone seems to have forgotten...original IL-2 ran like crap under DX9. That's why most people run it today under Open G/L. Open G/L..that's gotta be like a million years old!!!. But it gives good performance. Anyway, I have doubts about Direct X any version. It could be that Direct X will always be glitchy for the type of programming used in this game. Maybe they need to re-write CLoD in the latest version of Open G/L?