I am having problems with mate DT.
If I leave the machine idle for a minute or two, (even with several windows of TB and FF open),
I end up losing the DT altogether. All Desktop icons and panels disappear. Furthermore, even if I do not leave the machine idle (i.e. I am busy on the KB),
then if I decide to suspend to disk, and later on, turn on the machine and resume,
I have no DT, as if I had left the machine idle for a minute or two.
Is this caused by a setting? Which one?