Can't see/manage my groups anymore

Hi.
I wanted to invite someone into a group lib today, when I noticed, that group libraries vanished from https://www.zotero.org/groups/
There is one group (that I'm a simple member of) that's still displayed but all groups I administrate are gone.
Right now they still appear in my desktop app, but I'm hesitant to sync it now...

I'd highly appreciate any idea what could have caused this and how to fix it.
-timo
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