Nero Showtime: "Media Files" Window won't open

I’m using Nero Showtime version 1.5.0.41 in WinXP SP2.
When I select “Media Files” from the drive selection menu,
the window never pops-up and Showtime stops responding
to user input. It continues to play if it was playing something
and task manager thinks it’s ok. But no controls work and
there’s also no response to a right-click on Showtime on the task-bar.
I can drag files onto Showtime and create a list, I just can’t get
to the Media Files window to add/delete/order files.
I’ve uninstalled and reinstalled Showtime.
I admit I haven’t uninstalled the complete Nero package.

Anybody seen this?

Any ideas?