The first thing to try is just swiping the Feedback potentiometer back and forth, for it's full range of motion, 50 or more times in quick succession. If dust or debris is causing the processor to read erroneous values from the pot, this is often all that's necessary to clear it up.
If this doesn't take care of it, contact us through our dedicated support channel at support (at) davesmithinstuments (dot) com.