Answer: when Windows Media Player feels like it.
This one has me stumped.
When I run WMP 9 on my XP SP2 laptop,
full-screen mode works fine for movies,
but behaves strangely playing an mp3.
Clicking on the full-screen button works, it does
look like it goes full-screen, but the screen is
totally black except for a square area in the center that
has the visualization in it (I was using Ambience: Random
if that makes a difference -- all of them behave the same).
I repeat, I do NOT have a problem with getting into
full screen mode. The problem is that it is not
actually full screen. The controls are gone, only
alt-enter or escape exit the mode, and it exits
cleanly back into windowed mode.
Every diagnostic passes, turning on/off hardware
acceleration has no significant effect, and googling/browsing
web/newsgroups has completely failed me, what a surprise.
The only other things I noticed were that the
visualization seemed to be a finer resolution in
full-screen mode than in windowed mode, even though
the space used was about the same, and that it seemed
to be "faster" but that could be subjective.
As usual, this is a "worked fine 6 weeks ago
and I've changed nothing since then" problem.
Anybody else ever see this?
Thanks in advance for any tips/pointers ...