I've read through similar posts, but haven't seen exactly the same issue. Built it once, and froze during several calibration attempts. Stripped it all down, rebuilt it very carefully and still have same issue. I've since downloaded Brick Controller 2 and all motors/functionality seems to be there and working correctly. Obviously it's a very clunky interface for controlling the model, so then tried again with Control+, but had the same issue that it will move the blade a little, then just seems to stop trying anything else. Any ideas?