Look out for any Non HTTP 200 XHR Requests which are marked red.
Click on the failed XHR requests And provide screenshots of the Network and Response tabs. It is important that all headers are shown in the screenshot and the full response is readable. You can also copy-paste the response of the Response tab as plain text into the issue.
Lastly always provide a screenshot of the Console tab since JavaScript errors will show up there.
Please provide the folowing information.
Scenario ("what were you trying do do?") e.g. "I wanted to create an option and got an error".
Request e.g. the CURL Command or full URL and Payload (json) e.g. "curl -X POST http://foo/jira/...."
Response e.g. the Server returned HTTP 503 with subcode 50001 and the message "foo".