This is a duplicate report and the developers are already aware of this bug/problem.

Please check the feedback tracker to see if an issue exists before creating a new one and instead vote the original one up so the developers can see it's a common problem.

A list of important bug/issues that the developers are already aware of can also be found on the DayZ Forums:

http://forums.dayzgame.com/index.php?/topic/153994-early-access-important-information-known-issues/

Any additional images of the problem in question is always appreciated (if possible) and can be added by using the 'Upload File' section within a bug report.

Cheers