:banana: Hi guys,

Thank you so much for your help.

First of all, I discovered that I had been working on the wrong scene! Eight hours struggling with it, thinking that something had gone wrong again - AAAAGH! So I managed to get the job out, although it was an all-nighter.

The scene causing the trouble was one where I had tried to do some light linking and got it disastrously wrong - hence the strange fog lights.

Exporting everything except the lights did solve the problem with this scene. I deleted all the lights and exported the rest to a new file, and now fog lights work properly.

To quote Benny Hill: "Learning all ze time".

Alex: is there a reason not to scale spotlights with fog? I find I have to do that to get the fog to go far enough down the light beam.

Thank you again, both. I'll know how to get out of that one if/when I hit it again.

Julian