Ah, so Perseus's problem is fixed in 1.3... and since I'm using Infinity-style resources, I have to use MML to set level music, thus triggering the bug. So, the solution would for 1.3 to become the new stable- alas, this will require a programmer's attention.
Meanwhile, I'm looking at trying to fix Radix's complaint about the overflowing HUD graphics. The overflow I've fixed, but I EDIT fixed all my issues. I forgot to specify the "index" attribute of the "ammo" element, thus A1 ignored the line rather than tossing out the entire script as it often does when there's a syntax error. And the weird distorted alien weapon shape was the result of an errant "store pixels in column order" flag ticked in the shapesfile.
So, the HUD will be completely fixed for tomorrow's upload, as will be the water scenery names in the glade files, amongst many other changes.