So I used to have my GTA4 heavily modified. Every single car, els, lcpd:fr, iCEnhancer 2.1, indicator script, HD Textures, HD Roads, HD Road signs, Simple Trainer, and sound mods. Then I accidently formatted my hard drive and lost all of it.
Well I redownloaded it, and what have you, modded it like I had it before, but added the policing script. Now whenever I'm in game, and go to the police station, as soon as I come out, the worlds textures are fucked, cars don't spawn (including the ones you pick for your duties)
In command line I have the following
-noprecache
-memrestrict 2122317824
-norestrictions
My setup
i5 3570k
8GB RAM
GTX 670
128GB Crucial M4 SSD
1TB Seagate 7200rpm HD
The only difference right now, is that I used to have GTA 4 on my SSD. But I'm not sure if that will change anything.
EDIT: Removing Noprecache fixed the textures, but I still have certain cars that refuse to spawn. They aren't even the largest ones in the vehicle.img.