Face Mapping error

[artist_in_a_box]

This is a screen from my current work
rror by ~aerodyll on deviantART

I had the idea of saving UV space by tiling one window over anumber of faces by face mapping them, all the other windows and faces are fine but this centre face keeps getting this slash down the middle, i feel like this is somethign i should know about already btu can anyone tell me why and how i can get rid of this error?

Thanks for any time

Ben

[Ghostscape]

looks like one of the tris is flipped. If this is a quad, cut it into two triangles and whatever wacky vert shit is happening should either sort itself or become evident in the UV window. If its been triangulated already, then you need to flip one of the triangles.

[artist_in_a_box]

cheers man, knew it would be soemthig small like that, fixed it now.