Class 43 locos unable to be driven

I have been attempting to add some Class 43 locos to my route & session but have found that the majority will not act as locos. On setting up a consist in "driver setup" with "drive to" and "load" commands all looks to be well, but when you look at "driver setup" again the engine allocated has now turned red so it will not be viable in "driver". Within "driver" it says that a driver for the loco has not been allocated.

The details of two locos - the first works OK but the second will not. The config files are all but identical and I cannot find the difference.

Working:- GNER Class 43 MTU <Kuid:283805:43208> author: tmz06003

Not working :- GWR Class 43 Old Oak Common <Kuid:924255:100263> author: GJE140852

Can anybody throw any light on the situation ?

PS - the same problem exists in TRS19 as well.


Tony Howard