AMBX service was the problem. After disabling this service the game launched without having to be in WinXP compatibility mode.

Disabling AMBX service have fixed this. 1st time ever AMBX has caused an issue with anything since bought 3 years ago. Issue resolved so closing this.

Thanks I have now submitted a report for my first issue that is the game crashing on Launch when not in WinXP SP3 compatibility mode. (Separate to this issue)

OK I have tried to submit an issue but it fails beacause the 'Product Version' drop-down selector is blank. There is no way to select a product version and the form will not submit without it. I have tried with Firefox, Chrome and IE, all show a blank entry. There is no way to type in the version number either.

I'm not having much luck with anything DayZ related it would seem. I made a thread on the forum last night saying it is broken but no one has answered it.

http://forums.dayzgame.com/index.php?/topic/156438-unable-to-report-an-issue-product-version-is-blank/

Will do.

I don't get a message at all. When changing a setting like render resolution I get the blue spinning circle mouse icon on a black background. The game just kind of hangs like that. Task manager says the game is not responding.

I should maybe try taking the game out of compatibility mode again.

My pc is top end with gtx780ti gpu. ARMA 2 & 3 run perfectly well.

I'm running windows 7 64bit but had to put dayz.exe into compatibility mode to start up without crashing. It now crashes when changing nearly any of the video settings.