Ok do me a favour and try this to see if it is indeed the same problem.
Open the devtools either on chrome or on firefox, go into settings and toggle the option for “Disabling HTTP Cache”
Then, with the devtools open, try navigate through the panel.
If it’s the same error I was experiencing, the error should be gone while you browse with cache disabled.
Than that error is fixed. Because it was there on my installation and was gone as soon as I upgraded to the latest version. I think Bastian added a second header for the server in order to prevent that weird server caching.
ok, i think it really is fixed – at least when i try on safari and firefox, but using chrome, it still persists even after clearing the cache… which browser are you using?
Unfortunately, yes. It only works with the disabled HTTP cache as @manuelmoreale suggested earlier. We still haven’t gone through with moving to another provider, but will do this soon as the easyname support couldn’t offer any further help—they somehow weren’t able to reproduce the issue.
quick update on this: i’ve moved the site away from easyname to one.com, although i know it is not 100% ideal (see https://forum.getkirby.com/t/cant-log-in-to-panel/15809), because I keep having excellent experiences with their customer support. Now everything is working again.