I had some early problems with Live View in CS6 which were caused by pages that contained links to an external script (i.e. Facebook badge or ADD THIS widget). It didn't happen with NEWLY created pages.
Try this:
Go to View > un-tick Display External Files.
Go to View > Live View Options > Disable JavaScript.
Hope this helps,
Nancy O.
Alt-Web Design & Publishing
Web | Graphics | Print | Media Specialists
http://alt-web.com/
