Can you retry after upgrading? There's a change in Metacity which could fix it.
I believe I've seen it too. in my case shading/unshading the window by
clicking on the window title solved it, you may have to change yours
windows preferences.
** Changed in: Ubuntu
Status: Unconfirmed => Needs Info
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Random keyboard failure in X
https://launchpad.net/bugs/58884
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