Have similar issue since Steam update simply cannot get onto Epoch!!!!!!!!!!!!!!!! All I get is 'cannot open file' C:\ users\me\appdata\local\arma2oa\tmp\_cur\_mp.pbo most of which does not exist in that location (I've checked on spare drive), done all the usual dross recommended checks etc and a few bits that aren't but issue remains. Not much of an improvement if it stops players playing is it???? Wouldn't mind but just had issues with BE and DayZ SA and Steam, which BE patched really quickly and were just mega helpful. I read somewhere that Steam usually jumped on these issues fast but to be honest I see no help forthcoming at all.