Just experienced a hang with build 65 during redbook FLAC playback (only made it through Keith Jarrett’s Rio Pt. 1, Pt. 2 didn’t play).
Both zones (built-in and ASIO) stopped working at that point.
Exiting and restarting Roon fixed the issue.
(my usual configuration: Windows 10, dual Xeon, 64GB RAM, iFi micro DSD USB DAC).