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The "context menus" which normally show up on right-click, as well as other pull-downs (for example evince's resize screen or any program's at-the-top menu pulldowns) are invisible.

This is Ubuntu 12.04.

I know the computer still thinks it's drawing them because of the way left-click responds. But I can't see its contents.

What program draws these?

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up vote 0 down vote accepted

Found the answer here: How can I restart the menu bar in Unity?

Restarting unity solved the problem. This can be accomplished without killall unity; I just did unity and that worked.

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Although this solution wasn't without problems. Restarting unity ruined my browser session by confusing chromium about what had been open. – isomorphismes Nov 18 '13 at 21:10

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