Hi revoc,
I just started my Amazon HD trial period, and I have the same issue (having to check "Exclusive mode" on each startup) even though I have the latest version of the desktop app.
I am still finding my way around, but the albums I've played have virtually no credits to display (producer, engineer, etc., often not even the composer of an individual track). Coming from Tidal, I am used to having some minimal information about most albums, sometimes even short reviews. Have I missed something within the app?