.Map :: MoHAA Mapping

Just fixed it. I did select --> touching and snapped everything around it to grid, then i redrew the wall and its fine now. Thanks for the help guys.

I'm in the middle of making a map and one of my walls has decided to turn invisible on me (well one side of the wall actually). Its perfectly visible in radiant but seems to get lost when i complie and play the map :?

I've tried snapping the wall to grid and i've deleted it an redrawn it but still ...