Reloading the UI can lose the visualization for POST APIs Endpoints 

Workaround: To save a POST API endpoint so that it will be available in the UI upon refresh, you MUST click  "Save Endpoint". Clicking "Save Query" will make the API available to hit, but not refresh the metadata needed for the UI.

"Next page" button on GET API data preview will display continuous spinner if there is not another page of data. 

Workaround:  If you see a continuous spinner of the data, click the "X" icon in the UI to go back to the dashboard.

Username and Password credentials no longer required

Reason: The current version of the Lingk REST Plug-in for Nifi is a single user dashboard designed to be used behind your firewall. Authentication options for this dashboard can be associated with internal network restrictions.