It appears that the bug is caused by proprietary drivers. In my case, it was proprietary driver "ATI/AMD proprietary FGLRX graphics driver". Once the driver is removed, the window titlebar hover animation will continue working as it should have done.
It appears that the bug is caused by proprietary drivers. In my case, it was proprietary driver "ATI/AMD proprietary FGLRX graphics driver". Once the driver is removed, the window titlebar hover animation will continue working as it should have done.