no models in Left 4 Dead Authoring Tools

hello you lot,
i have been working on a L4D map and everything was running fine...till now
when i put down a prop_static and give it a world model, i get this:

As you can see the mod filter shows hl2
i can change it with my arowkeys to All Mods but when i press ok and open the world model thing again, its back to hl2
when i click on the folder to see what models are in, nothing happens

if you need more info or sumthing to help me out, please say so, so i can get back to mapping
ty in advance

close out of steam and anything running in it. trash your L4D authoring files or even game files and launch steam and then L4D. let it rebuild everything back.

tried what you said but it still wont work

in Hammer choose Options from the Tools menu, and then select the Game Configurations tab
Press Add to the right of the Game Data files list. An Open dialog will appear: choose L4D.fgd. Ok the whole thing and reboot Hammer.

there is only one left4dead.fgd
i delete it, reboot hammer
add left4dead.fgd again and reboot again
it still wont work

open Hammer. go to Tools / Options and take a screenshot of every tab page you have. and post them.
this is weird even for Steam.

here are 3 pictures, check the next reply for more pictures since 3 pictures is the max

here are the last 3

you are saying this is even strange for Steam but i noticed on the steamforum more ppl are getting it :s

check out l4dmaps.com forum. a very live community there.
steam forums are packed with kids for the most part and hardly any useful info.