Try opening the applet in Script Editor and performing a "Save
As...", Neil. If the "Startup Screen" ("Écran de démarrage") option
is checked, uncheck it and continue with the save. (If that's not
the cause of the problem, then there's something weird going on...)
I actually did that, though I tried it again just to be sure. It only
seems to appear if the track changes and then I hit pause.
I'm wondering if the delay I have in the code might be causing this?