I am having a similar issue. All editing in visual editor has no effect to the published page. The Text View shows NO source codes. (image link below) I only see source code by selecting TinyMCE source code view but edits to the source code have no results. (image link below)
TEXT VIEW
SOURCE CODE VIEW
PUBLISHED PAGE
Set the width and height in the Widget. That keeps the feed from spilling over into content but ruins the responsiveness of the widget. This customer site doesn’t have a very nice responsive look anyway so whatever. If you can think of a way to limit the width for Firefox browsers and keep the responsiveness please post.