I just discovered another loco from DTM that has been affected by the 2015 update.
A person can't use the dynamic brakes from the F4 driver interface on the DDA40X and the SP SD45 now.
I have to think, that the problem is probably affecting all the DTM locos.
I copied over my backups with no success, so I don't think the problem is in the Assets RailVehicles folders.
I still think it has something to do with the core game.