This is a very annoying usability issue. Hope to see a solution soon..
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Compiz's "show desktop" functionality differs to Metacity's
https://bugs.launchpad.net/bugs/91784
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ubuntu-bugs m
It seems that Mouse Gestures addon for Firefox solves the problem.
I also experienced this bug in "Zend Studio for Eclipse" (Ubuntu
Intrepid Ibex, run on a VMware virtual machine). Heavy loaded machine
increases the chances the bug happens.
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[MASTER] right click (with button release) might act