In e17 gamma, sometimes menus, like Chromium's main menu or Skype's main menu work fine but after some time, if I click to open them, they do not appear and are invisble, although the buttons still work if clicked. They appear again on restarting E, and work fine, but after using system for a while, it happens again and needing to restart e. This does not seem to happen with composite off (I think). Settings are Tear-free, smooth scaling, opengl on.
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