Just missing or corrupted textures. Defrag and verify files.
Also possible that your graphics card is overheating, if the defrag and verify doesn't help.
...I forgot what experience means.
I would be less worried about WW floating and more worried about the infinite void that opened up under it.
I guess we each have our own priorities...
That happened to me viewing in Atlas a couple years ago, right before my video card stopped working entirely.
Check to see that your video card isn't running hot, make sure your computer is *clean* and dust free and cooled properly, update drivers.
Aside from those things, if you start noticing odd textures like 'quilting' patterns on things (people, scenery) it's definitely time for a new graphics card. If that doesn't happen, just keep the compy cool.
Please read my FEAR/Portal/HalfLife Fan Fiction!
Repurposed
[ QUOTE ]
Also possible that your graphics card is overheating, if the defrag and verify doesn't help.
[/ QUOTE ] This was my roommates problem.
Theres no problem it just does that some times 
it goes away when i log.
Just thought it looked funny thats all 
Nothing happened, it's ALWAYS been a crappy game.
I've had my own graphical glitch before that I never figured out, and hasn't happened in a while since.
Way back in COV beta, there was one particular door which led a lot of people into glitchy territory.
My poor zombies. They didn't quite know whether they're in heaven or hell.
Of course, there are some built in glitches. I am still not certain, because I haven't placed one in a base recently, whether we still live on Bizarro Earth.
And then there was a geometry glitch under Port Oakes...
This is what I mean about the 'quilting' pattern on things. It was about a month of this and then my video card just did NOT work any more. If you see that, time to fix your compy.
Then there's also the headless guys behind glass. That's still unnerving.
Please read my FEAR/Portal/HalfLife Fan Fiction!
Repurposed
So the game was glitching out on me and i got these shots.
WW floating
People floating