The special key N+S MOOO resets the twiddler configuration to the default state until power cycled. However, in this state chording seems to be broken. Each individual key registered rather than a chord being registered once a key is released. For example the chord MOMO will register 'gvg', 'eve', 'gve', or 'evg' depending on whether the 'e' key (MOOO) or the 'g' key (OOMO) is pressed/released first. I think this might have something to do with timing? Experimentally I was able to avoid registering the first incorrect character by pressing the chord quickly, but I've not been able to release a chord without registering an extra character.
I'm running firmware Version = 0.17b. I encountered this behavior when my twiddler is connected to my phone via bluetooth and my desktop via usb cable.