Quote - I guess I am the fanboy here, but I'll never know the answer to my question, sadly.

But yes, of course, forgot to add that you must not apply any gamma correction to the render (override gamma must be checked), something that should be done automatically when saving to hdr or exr, a suggestion for e-on to implement in a future version.

Actually, I 'm fairly sure that Vue 10 also suggested I turn off / override GC... which I also did, in any case.

I will continue to do some more tests regarding this and will post an update on how I get on in case it's of use to anyone else.

Many thanks