Something similar happens to me.
When I switch or refresh a theme the lsThemeInstaller.exe process opens and don't close after the task. Plus a nb##.tmp process appears (## are numbers and/or letters).

The annoying thing is that when I continue to switch themes a second lsThemeInstaller.exe process is started. plus an other .tmp process.

The third time I attempt to switch themes A error message appears. And I can't do anything untill I kill the process lsti.

By the way.. It's my fist day using ls. I used the installer for installation and I'm using xp pro sp2.

Help fast please!