Good morning JimAlmond,
After updating the unit did you perform a master reset? If you did not that is what i would recommend. First you will want to back up all your waypoints, routes and tracks that you want to save. Don't worry it is an easy process, next I recommend you give our tech support line a call or your local Furuno dealer. They can either perform the reset for you or walk you through it on the phone.
C-Bass