[Zubersoft]

You can optionally restore the backup, then just delete the settings file associated with the face gesture feature to see if that fixes the problem (C:\Users\<your username>\AppData\Local\Packages\41730Zubersoft.MobileSheets_ys1c8ct2g6ypr\LocalState\face_gesture.xml). Or you can rebuild all the settings if that isn't a big deal for you.

Mike