@CaptC This bug happens if you manage to trap a creep in a way it cannot go anywhere. Usually happens with splitters. Can happen while juggling if you manage to wall of the exit (what should not be possible, but can happen, I did it once).
gefafwisp, the words do not affect the scores but the letters used on it. Specially brass. Brass letters can make a word score skyrocket. Blanks do very little damage, so avoid it (easier said than done).