Hi,
I had exactly the same problem today while listening to an album. Going to browse the albums list showed 0 albums out of 279, but playback unaffected. Using Roon remote on my iPad. On closing the app and then reopening everything was back for a time, but after closing the app and switching to Safari then opening Roon again, the problem recurred - 0 albums, 0 tracks and 0 compositions. No problems using Roon remote on my iPhone or my MacBook. You said this was a known issue, so any fix you can advise?
Regards, Ian