I have a site using a Twenty Twelve child theme.
If I edit a post or page and click the "Preview Changes" button, I get a "do you want to leave page" message. If I choose yes the page or post displays and I can see the changes, BUT in the same Browser tab. That should not happen. The Preview should open in a new browser tab instead.
IOW the Preview Changes does not open up in a second browser tab (target="_blank"). So I have to click the back button on the browser to return to the edit post page (versus just closing the Preview and still having the edit post available/open) and then the changes are lost.
I searched for similar topics and saw a lot and tried the suggestion with no luck. Disabled all plugins, tried reverting to Twenty Eleven Theme. Same problem exists regardless.
any help getting the preview changes functionality re-established will be very much appreciated.