I just went to play a Christopher Hogwood album by going to the Artist, pressing Discography then limiting to my library.
According to Roon I have 6 albums , in fact I have 42 !!
If I navigate to a missing album via the album view I can find them and everything looks fine.
I am not sure if this affects other artists ???
I have restarted the core, now rebooted the core. The network was restarted just before the issue was spotted. Other artists look fine so far
No need. Help is at hand Its a known bug. See here: