yes I have run numerous times the file checker via steam properties of the game and it shows its all uncorrupted and OK.

Just tried a Coop and DM same thing when it comes time to receive the mission file and sometimes when just starting it back up , it crashes to desktop, I do notice my Malewarebytes trys blocking certain IPs from Arma3.exe even though I have unblocked it, but even when I shut it down to play, I still get the same crashes so it must be unrelated, unless its due somehow to corrupted file somewhere.

The crash is happening on every-server I enter since the 20 meg patch and the hacking issue last week.
I only play wasteland so its only happening so far on there because I haven't played Coop or DM or any of the other modes because I enjoy wasteland.

Also its happening on custom and normal server, seems I can stay on longer with fewer players but will eventually happen regardless, unless I am alone, played hours and hours the other night when I was the only person.

The crash does not distinguish between custom or dev, stable, I have even tried running the dev build and it only got worse.

I am running steam beta client as well, not sure how that would possible effect the game files and shouldn't but extra information.