Well all is well and fixed. Without doing anything more, I simply logged out of Roon, waited 10 minutes, logged back in and everything works as it should.
@jimintally agreed! After the 2.6 update, the music has a more substantial presence (easier to ’see’ full size musicians and instruments). For me this translates to a significant improvement in the depth, musicality and microdetails apparent in the mid-base.
Happy listening.