This is caused by poor support for viewports in the applet.
** Changed in: gnome-panel (Ubuntu)
Sourcepackagename: compiz = gnome-panel
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Desktop effects and moving windows between desktops
https://bugs.launchpad.net/bugs/133018
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*** This bug is a duplicate of bug 126629 ***
https://bugs.launchpad.net/bugs/126629
Thanks for the bug report. This particular bug has already been
reported, but feel free to report any other bugs you find.
** Changed in: libwnck (Ubuntu)
Sourcepackagename: gnome-panel = libwnck