I hate to sound like a mee too, but updated this morning when I got back form my holiday.
No issues with Roon Core (on Rock) so far, but multiple Windows failures on the client already today.
First time it did not update any albums that were added to the library, and was just spinning like t was about to do something, a client restart and all good.
Second and third times the music stopped tracking what was playing, and seemed to just lock up, closing and restarting it fixed it again.
At least restarting the client fixes it.