Feedback HTML editor appears before wanted, obscures page content

[Hrynkiw]

With Administration > Site options > General settings > HTML editor: ENABLE, merely loading a page for viewing will bring up the HTML editor window. Additionally, the window is positioned so that it obscures the page tabs in the collection, hindering navigation. (Screenshot attached.)

Mahara v15.04.1
Under Linux and mySQL.
Reproduced under Firefox, Chrome, and IE (all of them reasonably recent versions).

Appears when page is shared to public, and visitor is not logged in to site. (Most extensively-tested scenario.)
Also when page is shared to Registered users while logged in. (Less tested.)

First occurrence noticed on a new page with no content. (i.e. The popup wasn't being generated by a Comment link on page content, but possibly by the Feedback link at the bottom of the page.)

Steps to reproduce: This bug is present on our production site, but I have so far been unable to reproduce it on our test site (same version of Mahara). There is obviously another setting/configuration involved. Changing HTML editor: ENABLE to USER-DEFINED has been our work-around.

Later: Arg. While documenting the settings for this bug report, we temporarily set production site HTML editor setting back to Enable and did NOT experience the problem. This report is being submitted anyway in the hopes it will help a future someone who is experiencing the same issue.

[Robin Leung (robin-leung)]

I think Donna is referring to this bug here, https://bugs.launchpad.net/mahara/+bug/1460850. I've been able to consistently test this throughout all our sites (test/production). All test cases were fairly consistent where the HTML editor admin setting is set to ENABLED and when the user is logged out or a private URL, the WYSIWYG (HTML editor) displays floating on the page.