Good morning allI having been using the 747 fro a while and it has been working but lately the autopilot will not work.. I have run through endless tutorial material and checked everything, fms is programmed properly,etc.irs is set correctly etc.but here is what happens1. it will not fly the fms route, no matter what, it just goes in circles. entering the next waypoint by lsk1 does not work, it just goes in circles. is as if the autopilot is not even engagedSOI tried to just fly it on heading bug and alt. nothing , it OVERFLYS and then GOES IN CICLES the all the time or ignores the autopilot command.even thought the ap is engaged.I have tried new aircraft ( different liveries) engines type , almost everything i can think of.. I have no cong messages on the eicas,,Im stumped!!!!!!!!!!!Thoughts , perhaps im missing something simple but i dont think so , it worked a week ago.Does this sound like something others have seen or is it corruption in the a/p or fms..( lastly i updated the airac. no help though)Peter K

A reinstall might help.