Has the black magic icon always been transparent in battle? Not in the magic list, but when it's actually casted, the black color is transparent through to the battle background. Was it like this on the SNES? I can't remember, but in SNES9x it's that way. I'm using the FF2us ROM.
Here's what's happening: since the text is only 2 bitplanes, there's only four colors -- black, gray, white, and transparent. The normal transparent is used to show the window background (blue). Apparently, black is used to show the battle background through, at least that's how SNES9x is rendering it. Does this happen in ZNES (or the other versions)?