Okay we believe the majority of issues are being caused by problems with graphics card drivers. For those of your with ATI/AMD or Nvidia graphics cards, we'd suggest removing your graphics card drivers entirely then reinstalling them to the latest as shown via our FAQ entry here -  Some users on AMD/ATI and Nvidia have found that rolling back to a previous version of their graphics card drivers has helped. So as a temporary workaround you may want to try going to your system manufactu