@Bill: "the problem does not happen when running [...] Unity GL with either of these window managers"
Unity GL is the window manager so I take that you are saying that the problem does not happen with Mutter. What I experience here is the same as described in the bug and that is with Compiz in a regular GNOME session (no Unity Qt). I believe this is an Ubuntu bug; I will look for a bug report.
@Bill: "the problem does not happen when running [...] Unity GL with either of these window managers"
Unity GL is the window manager so I take that you are saying that the problem does not happen with Mutter. What I experience here is the same as described in the bug and that is with Compiz in a regular GNOME session (no Unity Qt). I believe this is an Ubuntu bug; I will look for a bug report.