Some of the textures in the route are missing, their have also been problems with Locos randomly uncoupling resulting in track going into emergency brake mode, and some of the Signal displays fail to display properly.
Ive had the same happen - until i swapped some stock Theres a known bug from sherman hill stock (which SHG borrowed for the most part i think... engines namely) which causes the decoupling Swap some engines out, seemed to do the trick for me As far as the textures, ive noticed unpainted things like silos like this. Maybe itll be corrected- likely not