Alright, this is pissing me off something serious. I made a color modification of two tilesets from the RTP, 028-Church01 and 029-Church02, so that they would work with a rainbow fog I made in photoshop. The tilesets work, except for one small detail.
It won't let me choose my transparent and translucent colors!
It's just assuming that it already knows what I want and it's friggin' irritating! Luckily, it's got the TRANSPARENT color down correctly, but the translucent color is now unusable. I'm going to try restoring it to the color it was before the change and see if it picks up on it after that, but this is something I should not have to do. Why can't I select my colors?