New colour management problem

Hello.
I selected the new davinci colour manager as my colour profile and in colour tab has no problem and very impressed. So far so good.
But the problem is in editing tab. When I try to dissolve a png logo to a video shot something weird happening. It dissolves darker colours first!!! Did I missed something?

Nope, there's a bug with alpha and RCM/ACES. Right now, it only works correctly in DaVinci YRGB.

Thanks Jim