I am unable to relaunch it; neither it enables sending a report !
What version of Glyphs do you have?
And what color Preferences do you mean? The one in Glyphs > Preferences or did you add a color custom parameter?
Delete the file:
And restart Glyphs.
EDIT: I updated the Crashes tutorial with a section about deleting app prefs.
Or better, send me the file that I can fix the crash.