Smask - dull colors

Hello,
Acrobat renders this PDF with substantially dulled colors. Other viewers (Foxit Reader, gsview, xpdf, ..) display the colors correctly - see the screenshot. The PDF contains an image with an smask (originally a png with an alpha channel) which seems to be the cause of the problem. The colors are fine without the smask.
The PDF above is generated by my library but when you try to create a PDF from this image in Acrobat the colors are dulled in the same way. Also note, that the whole PDF document is dulled, not only the image. According to my experience, it seems that the problem is not specific to this particular image - any png with an alpha channel causes this issue.
So my questions are:
1. Is this an Acrobat bug or is it something at my end? I don't think it is related to the color management settings because the mere presence of an smask changes the colors of the whole page.
2. What can I do about it? Change Acrobat settings, adjust the image or smask attributes in the generated PDF, ...?
I would appreciate any help. Thank you.
Let me know if you need further information.

May or may not help...
Throw a 3-way color corrector on there and push the saturation. Drop the blacks and mess with the others a little.
Could help.
CaptM

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Smask - dull colors

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