Atlassian has fixed their issue and is rolling out updates as we speak. We have tested the fix and the add-on works correctly after it has been applied to your Confluence instance.
It can take up to 24 hours before the update containing the fix is applied to your Confluence instance. This is completely out of our hands as it is a Confluence update, not an add-on update.
If you cannot wait this long, you can ask Atlassian to apply the update with an immediate 15 minute maintenance window. You can do this by opening a support issue at https://support.atlassian.com/servicedesk/customer/portal/23
and referencing to http://status.atlassian.com/incidents/3hzqdpjrggrq
We are monitoring the incident. If you run into any issues, please let us know by opening an issue in our service desk: https://avisi-support.atlassian.net/servicedesk/customer/portals