If your registered products aren't showing here that they are registered, contact the helpdesk via the link at the top of the forum.
If your locomotives are not responding to driving commands, then there's something else going on such as a broken track at a MO-crossing asset such as a grade crossing, station, or industry, a disconnected where the splines are placed over each other but not attached, or a junction missing a lever.
To find out what the issue is, turn on your driver notifications by clicking on the spanner and choosing that option.
Also what does the red-bug show? This could be indicative of the problem you are having. Perhaps it's related to the coupling issue due to a faulty script. Click on the red-bug, highlight the error, and click more. Highlight the text, press CTRL+C and paste the test here in the message.