Library doesn't open

Hi Team,
for one of our workareas ( an extended one connectet to standard SAP S/4 Hana content) any library cannot be opened any longer. Regardless wich folder I choose I only get a "loading" screen. I doesn't matter if I try it from the manager of If I try to open a published link from the producer. My local preview still works but nothing from the cloud. As this is pretty new and as this function in other workareas still works, what could it be?

Bets regards Annette