Assuming you've tried uninstalling and reinstalling, and assuming you've scanned for corrupt fonts (which can bug up some programming), your best bet is to contact Adobe Tech Support. They'll walk you through the necessary troubleshooting steps.
Typically Adobe supports only current version. So, I am not expecting you to get Adobe troubleshooting on your Premiere Elements 11 (non current version) issue. You can try, but....
Have you tried for another set of installation files and installation of them after an uninstall, ccleaner run through, reinstall using the new installation files?
If you purchased from Adobe, you should be able to get another download of your purchased files from http://www.adobe.com and your Account/your Orders.
You can also download installation files from the following web site and insert your purchased serial number into them at installation.
Be sure to read very carefully "Note: Very Important Message" at that web site, otherwise you will get hit with an Access Denied message.
Please let us know the outcome.
Thanks for posting on Adobe forums.
I have just sent you a Private Message, Please check.
Try deleting the preferences. The following gives instructions for Photoshop Elements but substituting 'Premiere' for 'Photoshop' should be all you need - http://barbarabrundage.com/2013/10/28/photoshop-elements-and-os-x-mavericks/.
username->Library->Preferences looks to be the place to look.
Insanity is hereditary, you get it from your children
If this post or another user's post resolves the original issue, please mark the posts as correct and/or helpful accordingly. This helps other users with similar trouble get answers to their questions quicker. Thanks.
If and when deletion of the Premiere Elements 11 Mac preference file does become a viable troubleshooting tool, Steve Grisetti tells us where to find the preference file to be deletion in post 8 of the following thread
The Mac equivalent is Library/Application Support/Adobe/Premiere Elements/11.0
The target is the Adobe Premiere Elements Prefs file.
and its mention of deletion of the Windows and Mac paths to delete this file.