I'm part-way through GTA IV. I had completed all the Ray Boccino and Phil Bell missions and some of the Jimmy Pegorino missions.
At some point (I'm not sure when) the 'R' for Ray Boccino re-appeared on the map. When I visited Ray it took me back to the first cut-scene with RB and I've had to do most (but not all) of the Ray Boccino, Phil Bell and Jimmy Pegerino missions all over again!
I'm taking quite a scatter gun approach to completing the missions but then I thought that was the whole point of GTA type games i.e. you're free to do the missions in whichever order you choose.
Anyone else had this or similar problems?