So I have been recently having this issue on the San Bernardino Line where when I drive inbound towards Los Angeles, there is a signal just after the passing siding for the racetrack between Fontana and Rancho Cucamonga where the signal stays red and does not change. I tried this on two different morning services and I got 2 different error messages when I tried contacting the signaler. One said that switches for local freight spurs may be incorrect so I went onto the map and found that there were misaligned switches. However, when I aligned them to the correct position, the signal would still not change to green. I am not too sure what is causing this to happen but I would assume the switches are the culprit. Here are some screenshots to make this issue more clear:
