It turns out that Shuffle was turned on in the Queue page. Why that should affect the album page, I don’t know, but I turned it off and the problem went away.
Machine, Network and Software versions are in my profile.
Core machine. Output set to local Core Audio.
All local files. Mix of Flac and Apple Lossless.
On an Album page.
Press Play Now. Most tracks flash by and are skipped. Sometimes a track way down the list starts playing.
Pick a track and click, choose Play Now from the popover. Sometimes it works. Sometimes it doesn’t.
Try either action several times, and get different results.
Is not specific to any album or source drive. I’ve tried album on all three drives.
Attempts at Remediation
Restarted the Core machine.
Force Rescan on all Storage sources
Performed Disk Repair on all drives; no problems reported. All directories check out ok.
Checked to make sure drives aren’t sleeping.
Played the same albums using three other methods — Swinsian, VLC, Plex
This is super frustrating. I don’t care if Roon can’t do anything else, it should still play files-on-disk without fail on the same machine as the Core.
Yes to all of that, as noted in my original post, but not the network. These are local files (not) playing out of the Core. If it’s a network issue, it shouldn’t be. It’s displaying the allmusic data just fine.