I have the same problem: No sound after updating.
The update caused no problem with the files.
Play Back looks like usual, the mixer and the Halon-window shows sound activity. But nothing in the speakers.
I use the Steinberg UR22mkII external sound card. And I can hear music and system sounds - but nothing from dorico.
(Was it a fault that I downloaded and installed the low latency driver from Steinberg too. )