I didn't like my X4400H nor XT32, that I owned for a very brief period, hated it. The mid range compensation gave me a headache and sucked the life and soul out of my soundstage and I could not overcome it no matter what I tried. Then I moved to the Yamaha A3070 and it just blew the s*it out of the Denon, not in the same league so I really shouldn't compare them, but that was my upgrade path. The only thing I liked about the Denon and XT32 was the nuance to my soundstage it gave. But everything else paled to the A3070, clarity, soundstage size, drive, dynamics and most importantly, realism.If you do not have the extra funds right now, then maybe stick it out, but i just know for me, I would take a Marantz processor over the Arcam if you can downgrade to Audyssey. Also, Anthem's ARC is very good and I would rate it second best to Dirac IMO.
Sorry to hear of all of the issues. I had hum, hiss, pops, distortion, etc with the AV40. Dirac made it worth it but ultimately the bugs and reliability were just not worth it for my family and I.
Yeah, sticking out for now, cancelled my replacement as I think I manged to solve Atmos track distortion I was having (no one else I know had this - particular timestamps in films and intermittent). I think it was due to a dud filter and or Dirac ver. 3.0.5. Uploading the same 1.36 filter with 3.0.9 works fine, as does my 1.40 filter. Need to see about the distorted measurement tones still though. In all, in a much better place for now.