Default Face key cannot be restored after applying Motion+
If you apply Motion+, which has custom face expression to a character, you cannot restore default expression anymore. You CAN restore the default pose but not the expression. Default Key button on Face Key applet does not work. Expression from Motion+ seems to be baked as default. (Same thing is in iClone)
The only way to restore, is to take the character to iClone, split motion track and delete Expression key.