Certain props are not working

I have CSS installed, and had been using it no problem for years. Now, for some reason, many of the cs_office props show up as invisible, or error signs. Any ideas on how to fix this? I verified the css files, remounted the game, deleted the game and redownloaded it, and it still doesn’t work.

Make sure that both your Garry’s Mod and Counter-Strike Source folders are in steamapps/common.

they are

Post a GMod startup log.

When I try to spawn some props I get this in console. The prop spawns, but it is invisible. Other props, such as the filing cabinets do not even spawn

Error: Material “models/props/cs_office/computer_case” uses unknown shader “��a�^”
ERROR: Compressed vertices in use but material does not support them!

Error: Material “models/props/cs_office/exit_ceiling” uses unknown shader “vmt”

  1. Post a full startup log in

2. Are you using any custom shaders? Are your video card drivers up to date?

Adding Filesystem Addon 'c:\program files (x86)\steam\steamapps\common\garrysmod\garrysmod\addons\acf'
Adding Filesystem Addon 'c:\program files (x86)\steam\steamapps\common\garrysmod\garrysmod\addons\advanced duplicator 2'
Adding Filesystem Addon 'c:\program files (x86)\steam\steamapps\common\garrysmod\garrysmod\addons\advduplicator-master'
Adding Filesystem Addon 'c:\program files (x86)\steam\steamapps\common\garrysmod\garrysmod\addons\fixed_ninjaropes'
Adding Filesystem Addon 'c:\program files (x86)\steam\steamapps\common\garrysmod\garrysmod\addons\sbep'
Adding Filesystem Addon 'c:\program files (x86)\steam\steamapps\common\garrysmod\garrysmod\addons\uwsvn'
Initializing Awesomium..
No Kinect SDK
Unknown command "cl_thirdperson"
Unknown command "hud_showemptyweaponslots"
Unknown command "sv_backspeed"
Not playing a local game.
Addons have changes - remounting

I do not have custom shaders, and this problem has persisted through two graphics cards, one from ATI and one Nvidia.

Most likely corrupt CS:S content.

This only happens with cs_office content if that helps at all.

[editline]11th May 2014[/editline]

when I start up cs_office in gmod.

Check if everything works fine in CS:S. If yes, make sure you actually mounted CS:S correctly.

everything works in css

Try these things separately:

  1. Unmount all addons ( Including legacy )
  2. Unmount other games except for CS:S ( especially unmount CS:GO if you have it )
  3. Remove materials/ folder
  4. Remove downloads/ folder