I have an item that changes a creature's colors when it's equipped. One of the details I overwrote the colors for was the plume of the helmet (opcode Set Color). I experimented for a while with a white plume recolor, at some probability, then abandoned the idea and deleted the effect. But the white plume recurs. In another file I've thought to changing armor color to a shiny gold, the major color to blue. It didn't work that well, I replaced it with better combinations, but creatures colored that way continue to pop up somehow. I've scanned the lists of effects up and down - they are quite gone. I've tried renaming files, making the creatures unequip the item, rolling back to the BIFF versions of creatures, making a copy of the item with a different file name and pasting the effects there. It still happens. The only thing I haven't tried is make a new ITM file from scratch, instead of copying the old file. A bit too much work and no guarantee this behavior will end.
Has this sort of thing happened to anyone else?