Can’t use caulk for the sky it seems… In my map, I have a secret room. I have been using a temporary texture that is pink and says No Image Yet on it instead of caulk, so that I can see it ingame. When my sky starting messing up, I tried caulking just those outside skybox walls (except for the inside of course, that had my sky) and it gave me still that error. Then I fixed my skybox. I knew I did this because I went into that secret room (which must be teleported to) and realized that I never caulked the outside of those walls, only the walls of the main area. The sky that had no caulk worked just fine, but the other sky that had caulk behind it created the HOM effect.
I decided to look for some sky tutorials just to double check I wasn’t doing it wrong.
I used 2bit’s tutorial… he simply applied caulk and textured the inside face with his sky, just like I had.
So what am I doing wrong, any ideas? 
p.s. I have tried hullcaulk, I heard that was meant for it to a while ago.
Edit: Never mind fixed itself, dunno how.