App-switcher (alt-tab) hangs when playing video

[torbjorn]

If I use any of the two application switchers (Application Switcher and Static A. S. in ccsm), and I have a windows that plays video, compiz hangs at 100% cpu and in practice becomes unresponsive.

This started occuring the last 3-4 weeks and is 100% reproducible.

Likely suspet is the binary nvidia driver. lspci says 01:00.0 VGA compatible controller: NVIDIA Corporation GK110 [GeForce GTX 780](rev a1)

Currently running NVIDIA-Linux-x86_64-340.32.run from nvidia.com and $(uname -r) is 3.16.6-200.fc20.x86_64