As I suspected from point 0, this is the gnome-settings daemon crash (rather hang more correctly).
To 'fix' the problem temporarily I did:
# the SIGKILL is importaint, because the program seems to be hung completely and ignores SIGTERM
killall -9 gnome-settings-daemon
gnome-settings-daemon.
#At that point panel looks ok, but nautilus not, so
#Then restart nautilus as it seems not to pick the change
killall nautilus
I bet that this is a race condition just happened to be exposed by slow virtual CPU.
Yep, have exactly same issue.
As I suspected from point 0, this is the gnome-settings daemon crash (rather hang more correctly).
To 'fix' the problem temporarily I did:
# the SIGKILL is importaint, because the program seems to be hung completely and ignores SIGTERM daemon daemon.
killall -9 gnome-settings-
gnome-settings-
#At that point panel looks ok, but nautilus not, so
#Then restart nautilus as it seems not to pick the change
killall nautilus
I bet that this is a race condition just happened to be exposed by slow virtual CPU.