Shemashko

Its not the overheating of your card it is the problem with ATI cards and the AA. Just change your AA to disabled or low and it will go away. Somehow AA on ArmA 2 freaks out on ATI cards hopefully they'll fix it.

Yes, this is happening alot and makes the game almost unplayable all the other little bugs such as missing textures are not a big deal but bugs about saves can ruin a days worth of work in the coop campaign.