I have the same problem as well, everything was working fine till I updated Roon to the latest build.
I opened ticket without realizing this was already here, this was my post below. I am happy to hear its not just me because I know its not my network or computer now.
That is correct, my Favorites are just not loading everything else loads dispite getting an error that says:
“Error loading Page, check you network connection”
I have tried clearing the cash folder in local app data. I reinstalled Roon a bunch of times, I tried connecting to Tidel via a different browser and the Roon remote. I also changed my DNS servers on my local host and router. I updated the firmware on my switch and firewall, still no go.
Qobuz works fine, my playlists from Tidel show up too, everything works but I get that error and my Favorites page from Tidel will not load.
I even reinstalled Chrome and Firefox too. Tidel works fine from the app itself too.
I also tried disabling my firewall and AV software.
Not sure what the issue is here but it seems others have had the same problem in the past. However it does not seem they found solution as well."