Nope, vokiel didn't accomplish anything related to this issue.
Caches cleaned, WP optimize ran, the same window.onbeforeunload handler error "Are you sure you want to leave this page?" persists in IE 11.
Short codes are missing from the Visual tool bar, and the editor bar for the HTML option is still disabled by CKEditor.
Tried in Google Chrome 38, no nagging popup on saving edits, but CKEditor still knocks out any theme or plugin short codes drop downs, and disables the HTML editor bar.
Back to TinyMCE Advanced 4.1.1 and everything works perfectly in every browser.