I\'m using the tinymce-rails gem which uses TinyMCE 4 and I\'m loading the link
plugin and all this is initiated after/in a colorbox popup.
TinyMCE editor i
I found the answer once I narrowed down the actual issue was that I was loading the TinyMCE into a jquery.colorbox popup. Colorbox prevents any type of focus
event/action to happen outside of its defined container. Where as TinyMCE pops its stuff up through iframes, not actually in the colorbox container.
the fix was simple: in colorbox options set trapFocus: false
and all works as it should. Understand tho, this means the user can tab out of the focused colorbox to elements behind the overlay.
via John Naegle on stackoverflow