Comment 7 for bug 277195

This happens to me too, both in Evolution as described in the bug report and in liferea at the status bar, and just above the song progress bar in Rhythmbox. The last instance is particularly annoying because I sometimes scroll over the progress bar to move the audio forward and if I miss I find myself on the wrong workspace. Very annoying indeed.

Disabling the Viewport Switcher stops the problem, but using the Compiz default settings the Viewport Switcher is enabled. Perhaps it is best to have the default set to disabled.