When I try to edit a Lightroom 5 photo in elements 14 I get the error message opening lightroom 5 photo in elements 14I get the error cannot open files in the "Tiff image" format. Also true for PSD format. I haven't been able to find an answer to this problem on forums though I'm not the first with the problem.
Please make sure that you are selecting Edit In>>PhotoshopelementsEditor not organizer.
Also ensure Lightroom and Elements 14 are both up to date.
Check your set up in LR Prefs. Ensure during your set-up, to select the application and not an alias (shortcut). Also try setting 8 bit files, as Elements has limited functionality with 16 bit files. Go to this link for more info.
Thanks for your help