[Elecraft] K3 SSB LO/HI Cut not selectable?

[F5vjc]

Hi, Just noticed a problem with my K3, FW Revs 05.54

I can no longer select LO HI cut (vs. shift/width) in LSB/USB mode.
I understand this is a known side effect of changing the passband shift (PB
CTRL) from its default .05 to .01.
I can change PB CTRL to either .05 or .01 in CW mode but NOT in SSB mode.
In SSB mode it always shows N/A when attempting a change.

I've checked the known issues;  CW QRQ is OFF and SIG RMV is nor.

Is there something else I can try?

Thanks and Seasons Greetings.

73, Denis F5VJC