Driver Session keeps Corrupting

[oldfruit]

Help !!
In Surveyor I set up all my consists as required.
Go to Quick Drive or Drive Session. The screen is just blank. So I go to Find Object click on a consist nothing.
So I click on a Trackmark find a Consist to drive then find half the scenery has disappeared.
Go back to Surveyor and all the scenery is in tact.
Would be grateful for any ideas !!!

 

[pware]

Is this just with the one session or does it happen with others?

If it is just the one session then I would suspect a corrupt asset.