Sorry for the barrage of posts, but I'm just figuring out what's going
on.  Ever since activating the dual monitor function (that is, whatever
it was in the "gnome-display-properties" that required me to enter my
password--I don't remember what exactly this was), X always starts up
with the assumption that I'm using 2 monitors.  The reason why things
show up on some inaccessible workspace is that they are appearing on the
non-existent external monitor.  I've discovered that if I can guess
where the window is on the imagined external monitor, I can drag it onto
the actual screen.

So for some reason, X is not detecting displays on startup but is
instead assuming them.  As soon as I can detect the displays through
gnome-display-properties, it correctly detects that I'm only using one
monitor.  (Although, as I mentioned, it can no longer correctly guess
the monitor's maximum resolution, which it could do before I set up dual
monitors.)

-- 
Using dual monitors once results in permanently lowered screen resolution on 
main monitor
https://bugs.launchpad.net/bugs/289282
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