When images fail to download but Qobuz playback is unaffected, then RoonServer is usually having difficulty reaching/resolving image server URLs.
First, try clearing the cache as suggested in the post above. The next step is to ensure that Roon is added as an exception to any third-party network security (antivirus, firewalls, etc).
The next step is to ensure that your router has a reliable DNS server assigned - we recommend Cloudflare (1.1.1.1) or QuadNine (9.9.9.9).
If you’re using a consumer VPN with Roon, please first try turning it off, or switching proxy locations.