So, I started from cold and dark, got everything powered up & setup. After take off I got to about 5,000ft and the PFD and ND suddenly went a bit crazy, all elements of them both started moving or spinning randomly. The back up instruments were functioning normally. I saved the flight, exited FSX and reloaded. Initially, the instruments were normal but after a few seconds the same behaviour returned. Hard to tell if it is a problem with the way I have setup the aircraft or a bug. Any help welcome. Thanks!