Latex+beamer : little bug in acroread to render blocks

For all .pdf generated with pdflatex using beamer (for making slides), there is a little rendering problem in acroread.
Please see :
http://images.imagup.com/03/1212740471_Capture-2.png
You can see an horizontal difference of 1 pixel on the left, between the header and the body of the block. This screenshot is in fullscreen.
If I zoom in acroread, this difference disappears.
The same screenshot, with evince :
http://images.imagup.com/03/1212740636_Capture-4.png
It doesn't have the one-pixel-difference problem (but it has a shadow bug).
There is also a problem in acroread in shadow opacity :
acroread : http://images.imagup.com/03/1212741150_Capture-5.png
evince : http://images.imagup.com/03/1212741137_Capture-3.png
Do you have a launchpad-like to report bugs? Or this is the right place to report bugs?

Hello Romain,
Could you please send the PDF file to me at gaurav at adobe dot com. I will investigate the issue reported by you.
Thanks,
Gaurav

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