New to IFR and aircraft goes AWOL

[TheSevenflyer]

I suspect what you have experienced is the flyback bug.
You may be interested in this thread.

Approach flyback bug - Not fixed as stated in SU5

Please upvote and link any threads related to the issue of loading an approach in a GPS equipped aircraft it n will fly back to the last waypoint flown and lockout any further editing of the flightplan. Original thread here: Hopefully we can get this fixed.