I solved the issue on my laptop by making sure that ONLY xfce4-power-manager
--no-daemon was running.
(first killed all xfce4-power-manager processes, as I had several instances
running, then running it with the --no-daemon option)
Tip: Use kill -9 if you can't kill it normally.
--
You
*** This bug is a duplicate of bug 862430 ***
https://bugs.launchpad.net/bugs/862430
Same problem.
Happens on with both Desktop Wall and Cube.
Using Gnome Classic.
Nvidia GTX 560 with proprietary drivers installed.
Moving the window, then letting go of shift and then moving back to
another
