I’m on OSX 10.9 and found the UR22 driver causes kernel panic for several times during this week.
Attached is the kernel panic diagnosis log with the driver component highlighted.
Also I have noticed that UR22 generates glitches of sound when playing with QuickTime Player and the embedded HTML5 video player in Safari, while the sound is OK when playing with some other players and iTunes. Maybe these apps use different modes when accessing the device.
I have read the announcement that there will be an update to ensure full compatibility of 10.9, I’m just reporting this issue to make sure that similar issues will be tested on the new release.
Thanks and best regards!