The Internet ends at GF
16th August 2008
Here's my problem. The only reason I can think of is that there's a 'blockplayer' brush (textured on every side) at where the lightmap isn't smooth, but this problem doesn't occur on other parts of the map where these brushes exist.
8th October 2005
Looks like it might be a fog effect, too. But you said it's just the blockplayer brush nearby, no fogs? Odd.
Try applying clip to the blockplayer brush and recompiling. If that fixes it, the blockplayer is definitely the problem...
You know me as TheExile
7th April 2008
Nice map btw :D