Clicking on the "Notifications" entry in the iOS mobile app results in a modal "Loading Notifications…" dialog that cannot be dismissed and stays there forever. The only way to regain functinality in the app is to force-quit it and start over.
When clicking on "Notifications" on the app, the hub logs the following message:
[warn] Received cloud request for App 29 that does not exist, path: /menu/notifications/2 from xx.xx.xx.xx
This is with the latest hub FW (188.8.131.52) on a C7 - I'm not sure at what point this stopped working, maybe with 2.3.3?