Thank You - - - Thank You -- Turning off the "Simulate Empty Tank" cured everything ... the program apparently goes immediately into "Empty Tank" once the engine is completely shut down.
What a nice program - The "Kerfuffle is one of my most favorite planes on this, but I'm going to attempt to change a FMS 7 trainer (the gptrh.par plane) into version 8 for my grandson to tryout on the great program. The Kadet LT40 is also nice, but I like the handling and colors of the gptrh ... wish me luck!! Thanks again!:)