Created attachment 93586 [details]
Screenshot of a "minimized" game
After upgrading the X.Org server from version 1.14.5 to version 1.15.0 I'm noticing that games are mostly (~80% chance) still showing the last frame on the desktop if they are minimized (Iconify from Openbox). In this state I'm seeing the mouse cursor of my desktop and can navigate to the panel to recover the game. I have seen this on games with Wine and also on Minecraft if it is in fullscreen mode. In the attachments is an example screenshot (the game is minimized and my panel is partly shown but the last frame of the game before minimizing is still shown on the desktop).
Operating system: Linux 3.13.1
Graphics card: GeForce GTX 650
Graphics driver: NVIDIA 331.38
X-Server: X.Org 1.15.0
Window manager: Openbox 3.5.2
The issue still appears after upgrading the X.Org server to version 1.15.1 and the NVIDIA driver to version 337.19. I have also temporary replaced my GeForce GTX 650 with a GeForce 8600 GT and the issue appears there too which makes it more likely that this is really a bug in the X.Org server.
A bug has been fixed in recent versions of the NVIDIA driver that caused such a behavior. For example the NVIDIA driver 331.89 is working fine with the X.Org server 1.15.1 and 1.16.0.