ceph osd gui webinterface tree

We use Proxmox with Ceph in 3 Node Setup. All is fine. But now suddenly only node1 can show the Ceph -> OSDs in Webinterface From node2 and node3 the page is empty. Reload button: no error but page is still empty all other pages are fine. f.e. Ceph -> Configuration or Ceph -> Pools from node1...