Thank you for the tips so far.

I have been using the most recent version of the Mconfig application. I followed the procedure in TechNote 16. I succeeded in storing settings to the HD621. As noted, however, I could not store to the 861, and only then tried to use the Legacy program.

I have version 4.25 of the 861.

I will keep experimenting tonight and check in with Meridian in the morning if I continue to experience problems.

2-Channel: Mer 800, Wadia 170i, Ipod, Berkeley DAC, Clayton M300 Amps, Martin Logan Spires
Multi-channel: Oppo BDP-83, Mer 800, HD621, Mer 861, Clayton/Rowland/Classe amps, Martin Logan Spires & Stage, Revel Embrace, REL Stentor