Well, I hadn't actually used it after I was finished with the repaint!
I just now put some cars on the track and was able to couple to them with no problem.
I did have the same problem as AdmiralLeviathan on a few scenarios with the PRR RS-11. I eventually got them to couple but I don't remember how.
You shouldn't need any other geopcdx files. Have you tried with different cars?
Maybe someone else has an idea on how to fix this.
