Still struggling with CO1 color management of non-Raw

Hello,
I've already been in contact with tech support, but they seem unable to shed light on the issue that I'm having with the display in CO1 of non-Raw images regarding their way of being incorrectly color-managed.
Has anyone any idea on why on a modern Mac (10.9 installed), Jpeg or Tiff images cannot be displayed in large color spaces (e.g. pro photo)? You may be inclined to say that jpeg images for viewing are not intended to be in large color spaces, but given the widening gamut of modern quality displays, sRGB or even aRGB just takes away from especially vivid yellows/oranges.
Iphoto displays its catalogues just fine, fully color managed excepting the small thumbnails, but CO1 is unable to correctly color manage non-Raw images.
With Raw, you select an input profile and then a target profile in "view", this works correctly, but when I build a Jpeg catalogue with embedded pro photo, and want to display it, then the vivd colors are muted, which would hint that somewhere the sRGB colorspace is imposed. Phase one believes it is a matter of incorrect embedding of the profile or a wrong selection of the "view" profile, but the .icc profile is embedded in photoshop cs6, "jpeg linear" is the only option for input profile, and the view profile is pro photo, there's absolutely nothing to go wrong there.
The CO1 viewer however does not display the full color range of the image, as it is seen in Iphoto, photoshop cs6 ánd CO1 when viewed in Raw.
Anyone's got a clue as to what is going wrong in CO1's color management of non-Raw image display?

thanks
Chris