all 23xx chips suffer from faroudja MB. that includes the denon 3910,
Some believe its to do with the lack of onchip bandwidth.
It is a limitation of the chip in hardware form and not software hence why it has nether been fixed.
Denon may have found out how to mask the effect (which they tried with the A11 in the usa but with no success. its also worth noting that this dvd player also had the 2310 chip and this dvd player is the worst to exhibit MBB, so god knows why you think the 2310 chip is MB free)which is how the denon 3910 was almost cured from MB but its not fixed.
See this for the latest panasonic that has the same chip(2310)
Taken from home cinema secrets DVD benchmark test. This is quite recent as well
"I did my standard tests for this artifact via both component and HDMI outputs to my display. Via component video, there were no signs of the macroblocking at all. And I mean no signs. Via HDMI, there was still evidence of the issue, but it was toned down significantly since the last time I looked at this player. While it still has the macroblocking bug (MBB), this is one of the best players I’ve seen with respect to that particular problem."
As you can see MB is still a problem with the 2310 chipset.
Use this link for reviews for the 2910 and 3910 both suffer some degree of MBB
http://www.hometheaterhifi.com/cgi-b...deInt=0&mpeg=0