Hi,
> > You might have two screen savers installed and active.
>
> Ugh, how would that ever happen, and how do I find out?
>
> Where else would I look to find another screensaver?
/home/you/.config/autostart/ might be place? In my XFCE4 there
are xfce4-power-manager.desktop, xfce4-screensaver.desktop,
xscreensaver.desktop, even I disabled those from setteings..
That's certainly something I can do - I'm more comfortable on the
command-line than otherwise, but more of an old-school admin than
knowing how to edit the GUI config files.
However, my first thought after reading your suggestion was that it
was outrageous and not something I should have to do for such a simple
task :-)
I clicked the "Menu" in the lower-left, saw that there was a search
bar, and typed "screen". It presented me with the Screensaver icon, as
well as "Power management", where it showed it was automatically
turning off the screen after 30m.
I've now disabled that, and will see what happens, but I suspect
that's it. It's a real shame that those two apps don't work well
together.
Thanks everyone for your help.