Hello @MicZilla and @Frank_Brinks,
Thank you for the additional information.
To clarify the support status: while Roon Server can certainly run within a virtualized environment like a Debian VM on Proxmox, it is not an officially supported configuration. Our technical support team is generally unable to troubleshoot issues specific to the virtualization layer; however, in this particular case, we have confirmed that the behavior is a known regression affecting multiple users across various platforms.
Since this has been identified as a specific bug that our R&D team is currently working on, we are going to close this thread to consolidate our tracking.
We recommend that both of you visit the main tracking thread linked below and post a quick message there (or simply “Watch” the topic) to ensure you receive automatic notifications as soon as a fix or workaround is released:
Roon Ready Playback Failing to Initialize After Update - Investigation Thread
Thank you for your patience while we resolve this.