OK, well retype it back to 3 anyway if you’re only running two-channel. Part of the point of retyping it, even if it was on type 3, is to reset it if any settings had become corrupt.

Let me have a look when I get home (train delays!).

If you only have sources routed through the HD621, you could try setting the HD621 as Controller and your Master DSP to Not Controller, see what happens…

HC: 861v4/ID40/LPS, DSP5000, DSP5000VC, DSP3100, SW1600, HD621, Oppo BDP-105, Sony VPL-HW55ES
2-Channel: Oppo BDP-105, TEAC VRDS-7/Trichord Clock 3/PSU, 551, Quad 303, Harbeth Compact 7ES-3, Kimber cables, Russ Andrews mains and supports.
Previous Meridian: 5000C, 5200SL, 7200.2, 6000, 562V.2, 568.2mm, 800v4, 808.2i, 818v2/v3, 861v8, 502