This maybe just Mills or a general bug (not got time to check other trackis yet), seems to be missing the Pit Buildings and only the Glass or shadow of the glass showing up; Default PLR, HD7850 stock settings 12.6 driver
Had that in 95 aswell. Not consistent though. IIRC it occured on an off during the same online session. All setting on max except shadows (high). Oh, and that was on mills aswell. Can't rememeber seeing it on other tracks.