Yup, "We're sorry, but UIBuilder encountered an error and needs to close."
Totally, my dumb fault for not saving, but I was so in the zone that I didn't think about it. Sad part is I was only about 30 minutes from being far enough to test it, and i would have had to save it to do that... 
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'Tetht the printhiple, tetht the printhiple,' muttered Igor. 'Thorry, thur, but Igorth do not "tetht the printhiple". Thtrap it to the bench and put a good thick bolt of lightning through it, thatth our motto. Thatth how you tetht thomething.'
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