Winampaq kakked on me today, for no discernible reason.

(I had been using it for 3-4 weeks with no problems). When I try to open it, the screen flickers once, but the program won't open. I tried opening it from my Launcher shortcut, from the Start menu, and from File Explorer, no go.
It was working fine this morning. I did notice that when I hit "stop" the music just kept playing. So I closed it down.
This afternoon I installed the full version of Theme Master. I can't see why that would interfere with Winampaq, but that's the only unusual thing I've done today.
:confused totally:
All my other programs are working fine (AFAIK).
I've tried a soft reset and reinstalling Winampaq, still no go.
Has this happened to anyone else?
(I have an iPaq 1910. I'm running Winampaq off my 256mb Lexar storage card.)