hmmm... well I can't open it... I have Maya 6.5.

But- try this- turn all of your material's incandescense values to zero, and use skylight or physical sky. If that doesn't work, assign all materials to Lambert1- no incandescense, then use skylight or physical sky. If that works, then reassign the materials, phongs, whatever and THE LAST THING YOU DO would be to assign a material with incandescense to the meshlights.

Delete ALL history and run the script. (edit->history->delete all history)

-Matt