Updated to 2.449.
Same experience as the update to 2.435

I did not reboot the MD600 after the update to test the network interrupt problem that manifested before as music stopping after ~15 minutes. The same problem was there...
Rebooted the MD600 and, once again, my right hard drive(*) had gone AWOL. Switched off and poopped the disks out and in. After restarting, there was a perfunctory attempt to synchronise for a couple of minutes then the right disk fail light reignited.
Rebooting the MD600 has however (again) cleared the 15 minute interrupt problem.
I can now see and search, but not play, Tidal content.