Howser

By altering which settings in which files?

What's up with these disappearing helicopters? They are the only vehicle that shows this behaviour; http://www.youtube.com/p.swf?v....BFF9unk P4 3.0 / 1536 MB RAM / 7600GT / WinXP Pro German 1.01 version of ArmA with English language patch applied. Everything updated.

Here's how it looks on my computer, these are the smallest moves I can make. Imagine how impossible it is to aim at a distance...

Nope, I have nothing like that installed. I'll try a different refresh rate later tonight.

My copy is not pirated and I've got the same problem, it's very frustrating. I just installed OFP for the first time in years and instantly remembered why I uninstalled it all those years ago... Lowering the mouse speed and removing the pointer shadow in Windows helped a bit but it's still not good enough to make the game enjoyable.