Observation; duplicate posts. Noted in the use of the Banned Spammers Log.
And seen in the generation/editing of this post.
If the Default setting for Editor in Settings is WYSIWYG.
A new post authored will produce the post, however the Quick Response window after Saving is incomplete, and the page must be refreshed.
If at any time the Leftmost "Switch Editor to Source Mode" is moused, then upon the Save action, duplicate posts will be produced. The Quick Response window will be displayed correctly.
In editing this post, clicking Save action begins, however, never seems to complete unless I refresh the webpage.