BattleField Bad company 2 single player bug

BF BC 2 single player bug - suddenly I lost all my team mates... they aren't ghost in the action! they are gone! I'm all alone... that's what I call single player.
as you can see at the start, they are missing from the map, and later you can see they appear as ghosts in the clip...
my pc AMD Quad core with 4GB RAM and GF FX 280 with 1 GB memory, I'm running this game on Max graphics.
if you want the full clip from start of this stage in HD let me know and I'll post it.