Should I reinstall?

Every custom map I get nearly has texture problems, checkered textures etc.

Nearly every custom map at least, but the official Portal maps don't so i'm confused

Help us out lads and lasses.

Try recopying over the texture files from the .gcf's?

It's not my own maps in hammer or anything, it's actually ingame.

Grudge wrote:
It's not my own maps in hammer or anything, it's actually ingame.

Is your hammer running in the back? or try alt tabing out and going back in.

No not had hammer open for ages.

If i do buildcubemaps even without the required files, then I quit and come back, I have no gun or anything and I can't look around, but the textures are ok.

i have this problem too, but only on a few of the released maps. some errors about the cubmaps causing the textures to be ignored. here's the error from the console

Quote:
env_cubemap used on world geometry without rebuilding map. . ignoring: metal/metalwall045a

does anyone know if this is a problem on my end or with the map?

It sounds like the cubemaps in those maps were not properly built. Find out from the map's author.

that's what i figured. it makes the maps unplayable