Oh my, oh my. GIMP has automatically updated, and on my system has a crashbug whenever I change brushes. Yikes! How incredibly frustrating and poorly timed. Fortunately, I have heard of another FOSS image editor. Krita! I've never given it a fair shake, as I've used GIMP for eons, but I guess this their chance to impress me. I'm stumbling around a bit with it, but I like it so far. Another lesson learned. Turn off automatic updates for programs that don't need internet access. For now I just have to wait for the GIMP devs to fix the bug and release 3.0.1. Until then, Krita to the rescue. Thank you, Krita! You saved my Ludum Dare!