.Map :: MoHAA Mapping

Erm this is annoying, i compiled with a leak in the map, so i fixed the leak and recompiled now i have a black line running through the map, its not there in radiant and it disapears if u look at it from certain angles.

i tried restartin mbuilder and refreshing, ive made sure there is no view or access to the void, and ive tried moving the entire map but the line is still there in the same place, what can i do? i cant hide it coz its ctting thru corridors at head height.