It works well Al. As long as I remember to turn of the profile dialogue that opens each time a non adobeRGB image opens so I don't have to keep clicking ok
The bad news is, inverting to negative still doesn't help with PCFE, it still chokes. Oh well, It was a good idea while it lasted

. And like you Al I've learnt something today
I'll have to check out Virtual Dub and see if I can do it there as well