A couple of problems

I'm using build 110491
Set up a simple loop with a container station ( containers 011wt ) and a couple of trackmarks to check which tracks load and unload
Added a loco and a couple of container flats configerd for 40ft containers
Driver command drive to the container station load go via the 2 track marks around the loop & repeat
Frist drive went straight to the load but nothing loaded - back into surveyor to check the container flats for 40ft ok & moved the consist back to original start point
went back into drive and this time the consist just sat there and didn't move

I've tried this a few times and each time it refuses to move on the second attempt
Any ideas

Because you are using the unified driver to go from driver to surveyor, the sequence of orders stays as they were when you exited. Moving the train back to start broke the link. In the edit session, you may find that you have a reset highlighted to revert instructions back to the start.
Did you check that the container station has plenty of containers stored and they match the ones of the flatcar?