I've a atrium with glass roof and walls - I've set this up with really
large separate windows. This error about unit normal has popped up in
the .sim file (although my results have not shifted that I can tell.

**WARNING**********************************************************************
Daylighting coefficient calculation for SPACE LV8SE Perim
Spc (G.SE10)
for reference point 1 encountered an ERROR.
The unit normal for the contribution from WINDOW LV8Skylt
(G.SE10.E19.S1)
had a length greater than 1.0. WNORM was: 0.0000000
0.0000000 1.0000001
One or more WNORM components have been reset to 1.0 to
correct the problem.

Any ideas on how to fix this? I moved the daylight sensor location and
changed the azimuth but the error has not changed.

--
Jason