Thanks for your answer, pika.
Quote:
are you loading lscolor well before grdmagick? (lscolor needs a short bit of time to register all the color variables with ls)

That was the clue I was missing. I was loading lscolor last. When I changed to loading it first the problems went away.

I should have tried changing the loading order first. Especially since I know that the loading order can make/solve some problems in LS. That'll teach me.