Random exposure issue.

[djanim8]

I have this scene where at random times, the scene renders WAY over exposed, and then I can't get it to stop. Even if I change settings in the light or camera, it still stays with the same over exposure. This happened the first time, and I couldn't fix it, so I merged everything into a new scene, it was still doing it, and then randomly stopped. It was fine for a while, and then started up again. If I use the active shade, it appears to be exposed properly, but when I do a production rendering, it's blown out.

I've never seen this before! Has anyone else seen this? Was it corrected in a nightly build? I'm currently running version 3.50.04

[djanim8]

OK we found it.. not sure why this was randomly doing it... but there was a mental ray light in the scene!