Ok so I did some more testing and the problem seems to be with 96kHz material, watched a movie this evening.
Had to restart it 7-8 time before both front speakers played any sound, most of the time only the left or right speaker played.

For me the firmware is bust, probably gonna switch back to previous version waiting for Meridian to fix this version.

G61RSL, HD621, DSP7200.2, Runco Q750i