Zephyr for CLoud jira plugin - "loading add-on" is hanging all the time

[Lorna Bevington-Grant]

We are using Zephyr for Jira CLoud add-on

As of today we are unable to access anything, we are only seeing loading add-on or add-on is not responding.

We haven't downloaded any new versions, just simple stopped working today (31st May 2017)

Any ideas?????