Yes, I did revert those changes because they were preventing the loading of other types of glow-map images that we wanted. Also, as I recall, the way it was written it didn't actually load glowmaps for it_world images, either (because it was an "else if" clause after one that had checked for it_world). At the moment, I don't see the harm in testing for glowmaps for all images; we might want them eventually. If you'd like to add some restrictions back in, we can do so.
And your logfile seems normal as far as i can tell, which means I'm still stumped by your magical-rainbow glow.