I seem to be getting NaN for my build estimates fairly consistently since updating to 1.1.0.
Model used in example: http://www.thingiverse.com/thing:37327
Screenshot: http://i.imgur.com/ZJxbmcG.jpg
Gcode:
Edit: Seems to happen regardless of scaling, I tried it at 25% in the screenshot after full size and upscaled didn't work either