Can't build cubemaps

[Ultimate Bread]

Go to steamapps/username/team fortress 2/tf/maps, rightclick your map and go to properties and make sure that it is not for whatever magical reason set to read-only

You could also try installing TF2 Beta, copy the .bsp file in the folder I just mentioned to the tf2 beta maps folder and build the cubemaps there, to make sure you don't have any tf2 settings that ruin it

EDIT: Neither of the options you mentioned work.

 

[Ultimate Bread]

I just noticed that the problem wasn't regarding the cubemaps after all, they are compiled, my light_env had a couple of missing values and now my map has a normal lighting and normal cubemaps.

Thanks for the help though.