You could try:
1.Hard powercycle 861
2.Store firmware v 4.1
3.store your old pre 4.18b config
and then if the error message is gone
do it all over using firmware 4.2 and Mconfig.
You probably should not fetch Config data from 861, but create a all new Mconfig based on you r old config data

/GeirH

Geir

861v8, 504, 2*DSP8OOO.2, 4*DSP5200, F80, Barco CineVersum Blackwing two, DVDO VP50Pro, Sooloos Control-15 & Twinstore, Oppo-BDP103EU,
HD621, Dune HD Base 3.0, Apple TV, Mac Mini