I have noticed that the entire Fulcrum application will crash if a user account does not have permissions to a linked applications (via Record Link field), and then tries to select records from that linked app. An error message pops up "Unfortunately, Fulcrum has stopped." and returns to the device's home screen. All entered data for that record are lost.

This is different behavior than in a web browser, where the Record Link field will simply display a message "This account does not have permissions to this application".