Png in pdf : acroread bug

If you put a png image in a pdf (with latex → pdflatex), it works with other viewers (evince, kpdf), but not correctly with acroread.
Please look at the screenshots :
evince : http://www.monsterup.com/upload/1212654879.jpg
kpdf : http://www.monsterup.com/upload/1212655058.jpg
acroread : http://www.monsterup.com/upload/1212655093.jpg
Is this bug already reported?
How to report a bug in your site, you don't have a launchpad-like?

I added :
\pdfminorversion 5
So the generated pdf is pdf 1.5 (seen in pdf properties in acroread).
But the problem with png files still occurs.
To resolve the problem, I just remove the alpha channel (in gimp for example) of my png, and acroread displays it correctly.
EDIT: with \pdfminorversion 7 (pdf 1.7), acroread has no the bug.
png are correctly displayed.

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