Doesn’t happen on my steam version so problem must be you or GOG version. No one else has reported this issue either.
What comes to no path, you have a part missing from your catenary. It probably is just one sleeper long, but a piece anyway. And missing.
Easily happens on station approaches with lot of points or just at the end of the platform. Re check carefully and make sure you get red everywhere with the upgrade tool. If you don’t have discontinuity, then highlighting the line will highlight the station as well. And wise versa.