Thanks Beefyman :P
Actually I think I know what might have been the problem :P
I think I tried to overclock my PC a bit too much that night and it wasn't processing everything 100% I clocked it a little bit back last night and all seemed OK. Funny thing though it was only the stairs. everywhere else was OK. And other maps too.

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I couldn't tell from your sc, can you see active players through the walls or just corpses and bsp architecture

I could see other players and corpses etc..

Just checking because if you are outside the bsp construction (can be done easily in spec mode) looking in you can't see active players, if you could only see corpses and not active players than it would just be a bsp hole.

No I was not specing, and I could see players. not only corpses. But it was only the stairwell. I think It just might have been a rendering problem. It doesn't do it anymore.

hmm... time to go crank up the system a bit  

I was giving speccing as an example of how the effect that i was discribing. (getting out of the bsp structure) It is easily accomplished while in spectator mode. If you were in a bsp hole the effect would be the same