"The car doesn't not show up in-game correctly, only see parts of it" bug-
This bug is very common with ATi card users, and here is how you can fix this-- enter boolProp useShaders true and boolProp bumpMapping true cheat codes in the cheat menu, this will happen everytime you go in-game, so just re-enter the cheats

"When I minimize my game and maximize it again, it get a "blacked-out" screen in-game, or when I first went to my hood, the screen was all gray??" bug-
This bug is very common with Nvidia card users, and this happens to me too, here is how you fix this one-- while in-game, in hood mode, or sim mode, goto options and goto display menu and adjust your monitor settings, when it asks you to keep changes, click cancel, so now your setting are the same and the bug is gone, until it happens again, just redo these steps