Well it seems I was premature on the fix I tried on my lash up. After going out to dinner I came home and started it up again. This time the rear unit came on at full power and pressing the direction button did nothing but change the direction but did not sync the engines. It was impossible to get them to do anything. I deleted the engines from the lash up. I did loose two traction tires in this mess.
I guess I will give up on lash ups for now. Guess I'll upgrade to 6.1 and see if that makes a difference.
Dave