I have this very annoying problem with hammer:
Recently I noticed that I was still running the old version of Source SDK(episode 1),
so I decided to upgrade to the orange box version.
After I did this I started up Hammer, everything looked okay at first, but then I saw that some textures where missing (they showed up white) and some models were ERRORs.
Then I browsed my textures and entities and I noticed that everything Counter-Strike related(models, textures, etc.) wasn’t there.
I have tried fixing this (refreshing game content, resetting game configurations, reinstalling Source SDK and adding the cstrike.fgd file at game data files) but nothing worked.
Any ideas on how to fix this?