System menu bug

[Soare Catalin]

Hello,

I think I might have found a bug in Ubuntu 11.04 with and without Unity.
Whenever I try to bring up any window's system menu (with alt+space or by
clicking on the app's window icon), the window manager (please correct me if
I'm wrong) crashes. All titlebars from all applications dissapear, and
windows become unmovable.

Does anyone know if there is a workaround for this?

Thank you!
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