Ooh, that's interesting, and you're right - it shouldn't happen. I'll check it out.
Yeah, I'll probably include the colour naming later on as an option. I didn't have enough time to get it working as well as I'd like and wanted to fix the crashing bug, so released it as it was. The plan is to adapt it with RTG support, at which point it should be possible to choose any screenmode (or open it on a 24-bit Workbench screen), so that will allow the larger screens for better previews. It's on the list
Thanks for the feedback!