We have the same errors: 500 (Internal Server Error) followed by Uncaught Error: Script error for etc.
We are running Qlik Sense Server 3.2.1 but we had the same issue on 3.0.4
If we hit refresh on the browser the hub opens without an issue.
Qlik support have suggested that it may be a communications error and that we should get the network admins to look into it. We have not found a resolution yet.