I was driving NJT service 3838 east bound from Trenton with the cab car leading. When I left Elizabeth the doors would not close so had to abort the service. I was using the keyboard shortcut the 'u' key for the right hand side. Had no problems with the doors prior to this. I had done a save and resume several stops west, but the doors worked at the stops before Elizabeth.
This was an issue on NEC:BP if you tried to open the doors while the train was in motion. I haven't played in a while so can't say if it was fixed, but if you would like, you can try again (assuming you still have the save) and maybe see if you were accidentally pressing u while the train was moving. Alternatively, you can use the free cam to manually close each door, but only if you want to. It can be quite tedious for some.
Will give this a try. I do usually press the open key prior to a full stop, but never had this happen before.
Yeah it's not consistent, but not doing that fixed it. Only affected NEC:BP for me though (I don't have the new US routes...)