Documents in the cloud seems to be dead after update

After the latest update (Mac and iOS) iCloud Documents is no longer working. icloud with calender and contacts is working but not documents in the cloud.

I use iwork on all my devices (iPad/iPhone/Mac) and it worked well in the last year. Now all functions are dead.

No up/download from/to Mac. Tried log out/log on to iCloud no change. Tried to connect via browser, but after selecting Pages or any other iWork app i'm always asked to give in my apple ID again. (This was working for weeks without any problem)

Any idea?