Comment 11 for bug 1200829

After some debugging and looking over the vpswitch plugin code, I really fail to understand how this is the fault of the plugin. When the binding is in place, the code does some checking to make sure the mouse pointer is over the desktop window and if not, just return false. Nothing of significance has changed in this plugin for some time.

I tried your test-scroll PPA and it does indeed fix this issue, so that is even more evidence that this is a Gtk issue. It seems https://bugzilla.gnome.org/show_bug.cgi?id=703062 is the real root of this issue. The patch that fixed that has been merged upstream and we need to get it into Ubuntu as well.