Glad somebody started this topic. I have reported this problem twice following the automatic updates for 20.0.87 & 20.0.93, but those reports tend to fade as new versions become available. I have not tried 20.0.96 yet, but there was still no mention of a relevant fix for this problem in any recent release notes. I keep returning to 20.0.63 because it works, but thank you for suggesting that I might be able to advance to build 73.
Potentially relevant info:-
WALKMAN NWZ-E436F; Windows 7 pro 64bit; ASUS Maximus VI mobo provides USB-2 and USB-3 ports. The Walkman's cable is "permanently" plugged in to one of the rear USB-3 ports.
WDM driver is not installed. (Because it does not play well with the driver/mixer for the Steinberg UR44. The Steinberg/Yamaha audio device driver is rock solid, but I never expected it to be compatible with MC's WDM driver as the UR44 audio interface is somewhat more than a USB-DAC.)
Cheers, RC
PS. I just tested build 99 and it still makes empty playlists in the walkman. I can't seem to get hold of build 73, so I'm about to restore build 63.