Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
Try going into Settings, then re-enter your password ***** your Enterprise server (or other server.) Then hit Save.
This will cure the problem, if it is a matter of the 'hub' being stalled by a call to the server that is not authorized (by entry of correct password, or the like.)
If that fails, try restarting the hub screen by swiping 5 times from the upper right of the hub screen.
There are other things to try also. Let me know how it goes, and I will advise you further as needed.
And if it works, let me know, so that I may close this case. Thanks!