Thanks for the suggestion, but no I don’t have or use Logitech G Hub. I had a few other Logitech services running, for keyboard, mouse & web cam but even after killing these I still get no album art in roon.
After changing DNS setttings to Google’s, clearing the logging out of Tidal and logging back in, clearing the roon image cache, changing the image database size to a smaller value of 256, uninstalling the roon app (removing all settings) reinstalling then rebooting the album art is now showing. No idea which of the steps fixed it but there you go.
Welcome to the forum and thanks for letting us know that the issue is resolved!
If you run into any other Roon difficulties, please do let us know and we can certainly assist, thanks!