I've just sent an email to Meridian support about this, but was wondering if anyone else has hit a similar problem.

Simply put, I cannot get DD5.1 from a DVD when using the "DVD" source. With exactly the same settings as used for the DVD source on both the 565 (software version 4.4) and the 562V3, but using the "Laserdisc" source, I get 5.1.

I did not have this problem before I added the 562V3 to my system - very, very odd.