When attempting to examine the log, clicking on the Errors or Warnings link does nothing. It turns out there is a failure to retrieve the required JS, because although the browser is connected over https, requests for JS resources are being made over plain http:

Blocked loading mixed active content "http://.../plugin/log-parser/js/log-parser-behaviour.js"
log_ref.html
Loading failed for the <script> with source "http://.../plugin/log-parser/js/log-parser-behaviour.js". log_ref.html:5:136
Blocked loading mixed active content "http://.../plugin/log-parser/js/log-parser-behaviour.js"
log_content.html
Loading failed for the <script> with source "http://.../plugin/log-parser/js/log-parser-behaviour.js".