Sounds like more great glitches from the rockstar people, man how many where there in all the gta games,lol.
Maybe you got a bad disc?
I kid you not, my copy of san adreas on the ps2 was broken by a glitch and won't even load,lol.
Still not as bad as ones i found in mass effect 1 like getting stuck after saving in the elevator and having to start the whole game over, or commander shepperd getting into an elevator on the normandy only to fall through space,lol. Or that glitch with the frame rate, or bad ai on teamates that they supposedly were going to fix in the pc version.
Then there is the glitches i found in fable 2. Seriously i wonder how the people paid as testers even have jobs. Rush those games out the door nobody will notice until it breaks their game.