How to fix textures in hammer (Confirmed!!!)
To fix the purple checkerboard issue with several Portal textures in Hammer:
1) Download this file: dload.php?action=file&file_id=4
2) Unpack it in to your C:\Program Files\Steam\SteamApps\Username\Half-life 2 Deathmatch\hl2mp
3) Cancel your eye appointment.
Note: I did not create/make this, So please do not give me any credit for this. I got permission from the person who made this to post this.
And have fun no more black and puprle textures xD
Also, the creater wanted me to post his SteamID page.
But other then that its awsome!!
msleeper wrote:
Holy shit, does this really work? What materials does it fix? (FYI, at work right now and not at home, so can't try it out myself.)
All of them, to the best of my knowledge. If you come across anymore giving you problems, let me know and I'll fix those ones too.
This will make mapping even less annoying! 
Seriously, thanks!
the portal engine aparently does not support npc weapons, only melee...
I will retry the above fix.
quentin wrote:
Actually I extracted the files in question on this thread, and even thou the textures were fixed in hammer, when I compiled the map... they came out purple and black.. and another thing I noticed is that the combine soldier I put in the level would shoot at me, but I would not sustain damage... however if I got close to him, he would punch me, and I WOULD sustain damage... so..the portal engine aparently does not support npc weapons, only melee...
I will retry the above fix.
Make sure you didn't put the files in to your portal game directory. If you did, they will cause problems.
Mapster wrote:
This doesn't work with concrete_modular_floor001c
It works fine for me and everyone else that I've talked to