This is puzzling me!
After months of play on the same computer, I suddenly getthis problem too! And the worst part is, I haven't altered anything on its configyration (AFAIK) ofc).
So it's not a hardware issue. Neither can it be the installation of HOI itself. I also tried experimenting with as well resolution as monitor refresh rate. No avail.
So please tell me, could this be caused by something in DX? Directx is the only component I can think of that would have been altered without my particular attention (some games do not check for newer versions

). If so, which part should I be looking for?