Mark, the artificial horizon sounds like the AHRS alert popped up. This probably means the Stratux was not straight/level, or it was goofing up. You can disable the alert here: Menu -> Setup -> Alerts & Warnings -> AHRS Alerts, set Pitch and Roll to "Disabled". But might want to figure out why the Stratux AHRS is off.
To fly "Track Up", be sure you also touch the "Track Aircraft" button (the target looking button just above Menu). When you start panning around, the map will freeze orientation until you hit Track Aircraft again.
Thanks,
Walter