The admin wrote "Engineers have identified and now fixed a bug that was impacting the old dashboard. "
I have the error message both when accessing an Adventure Lab that is currently being created and when loading queries with Locus.
The message "Please check Geocaching on Twitter for updates. " does not help at all. I don't have a Twitter account and won't be signing up.
If you pay a fee as a premium member, you should expect it to work after 2 months.
Unfortunately, I can't find any idea how to avoid this error message. That is a great pity.
Any help is welcome. Happy geocaching!