Thanks for the reply!

I don't think it would help to share a scene seeing as it happens in any file I open, even a new scene with absolutely nothing in it. For the moment I have to roll back to an older version as I need to do some renders but will try again when I get a chance.

Ok I thought that might be the case. Any idea why it would work in Standalone but not the plugin then?

The adaptive sampling looks amazing :) I'd love to give it a go but for the first time I'm having trouble upgrading to a new version.

So I upgraded the standalone to the 3.06 test version and my plugin to the one linked at the top of this thread.

When I try to start rendering I get a render ...