I've noticed a bit of an odd error in my Marathon Terminal script. It works flawlessly in standard ZDoom, but our beloved GeeZee* doesn't agree.
*...or GeeZed, for all you Canadians.
Try running the above linked wad with GZDoom. Do all the standard text colors turn into garbage for anyone else?

I get something that looks like this, and psychedelic tutti-frutti isn't exactly on my list of wanted features...
Apparently it's a bug with TEXTCOLO handling. If I comment out that lump it works fine, and yet, ZDoom won't display the bug either way. A ghost in the machine, perhaps?