Originally Posted by Truman
1. Can you configure the 861 using the new configuration program?
Yes the latest mconfig is required to setup the 861 and HD621.

Download it here:
http://www.Meridian-audio.com/support/download-installer.aspx

Sometimes turning the 861 off and on with the switch in the back helps.

Disable any antivirus software - Norton etc.

Check out the wiki for potential RS232 issues:
http://bit.ly/c0ajn7

Read the HD621 TechNote16 on the upper right corner of this page:
http://www.Meridian-audio.info/show.php?compid=228

Calling Meridian in Atlanta is a good idea, if you are still struggling.