White screen on PC (Win 11) but Roon running fine, can be controlled remotely and plays music

Roon Core Machine

Dell Area 51/Alienware, i9, 64 GB RAM, 36 core, Windows 11 PRO; audio files on onboard HD.

Networking Gear & Setup Details

Ethernet into AT&T Fiber Modem, WiFi into same modem, 1GBit, upload/download speeds > 500MBits, VPN ExpressVPN installed but not used.

Connected Audio Devices

Core - Schiit Modi+ DAC on USB; Remote: Cambridge CXN V2 via UPNP/network

Number of Tracks in Library

10000

Description of Issue

Upon starting Roon on PC (Core), white window appears, blank white, no Roon logo; after a few seconds window title changes to '(Not Responding); Task manager indicates, however, that Roon is running. I tried to access the Core via the remote/control app from both Android Phone and another PC, and everything works fine, i.e. the control connects to the core, I can play music etc, do everything as normal.
I tried to do a clean reinstall of Roon on Core, everything works fine until I reboot the PC, and then the white screen issue appears. I repeated this a few times, error can be reproduced.
I updated NVIDEA drivers to most recent version; firewall on or off does not make any difference.
So it’s more a nuisance at the moment as I can’t operate Roon from the Core, but everything is working if operated remotely/via control. But I’d like to hear if anybody had such issue and what helped.

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