Roon problems on harddisc music files with Catalina for Mac. Why?

Core Machine (Operating system/System info/Roon build number)
MacOS Catalina.

Network Details (Including networking gear model/manufacturer and if on WiFi/Ethernet)
WiFi

Audio Devices (Specify what device you’re using and its connection type - USB/HDMI/etc.)
Linn Accurate.

Description Of Issue
After installing Catalina for Mac I cannot longer play music from my external hard drive. Why?

Known problem subsequent to the Catalina upgrade. Roon is working on a solution.

Hi @Arnt_Berg_Rognli,

Please see this post: