Cube maps only work on my computer.
This one is a little hard to experiment with, because the issue doesn't show up until after I have uploaded my chamber to the workshop. But it seems that whenever I use pakrat for a chamber, the cube maps only work on my computer. Does anyone know why, and what I need to do to fix this problem?
Are you paking the content before or after building your cubemaps?
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I can't open the bsp file after packing it. I haven't seen issues before I pack, so I haven't really tried to build cubemaps. I just put them in. I'm still kind of new to hammer, so I can imagine that I am missing something there. Ill try to look into building them, lol, maybe thats what I'm missing?
Ok, I just tested by doing what skotty just said, and that didn't work. I built the cubemaps, packed textures, then published. I played the published version on my computer. It was fine. I had my brother test it on his computer, and it was horrible.
@Goldenknighttim: what you put inside your maps is an entity called env_cubemap. But still, you need to run the command buildcubemaps after you loaded your map via the console. For this command to work out you need to put a copy of your map into your portal2/portal2_dlc2/maps folder, otherwise the cubemaps building will crash.
After building cubemaps correctly, problems with cubemmaps can come via 2 possible ways:
a) Once you finished building cubemaps and packing the custom content, you ran p2map_publish.exe BUT chose any other copy of the map from whatever other folder than portal2_dlc2/maps, like for instance your portal2/maps folder. Still, when you run your map via the console in your computer, you load the correct map since the portal2_dlc2 folder has priority over the rest folders.
b) You left a space into your map's name, and even though you pick it correctly from portal2_dlc2/maps when publishing, the p2map_publish.exe program renames it removing that space and maybe giving it a bunch-of-numbers-type-name.
Revise and let us know if you finally manage it 
useful tools and stuff here on TWP 
[spoiler]
[/spoiler]Do underscores count as spaces? I have underscores in the names. However, I have been doing what you are saying to do. and it works on my computer, even after I play the published version, but it isn't working on other machines.
No, underscores are fine... If you are uploading the file you have into portal2_dlc2/maps with the cubemaps already built in, no clue then, man, sorry.
useful tools and stuff here on TWP [spoiler]
[/spoiler]Thanks anyway. Ill post on here if I find an answer.