Drupal 7: CKEditor disappears after saving content - drupal-7

I recently updated Drupal to 7.39 and CKEditor to 7.x-1.16 and I am now experiencing some bizarre behavior from the editor.
If I create new content, I have the editor in place. Once I save the content and come back, the editor is gone and is replaced by rendered HTML code. I am also seeing this when going in to edit some existing content. All content tested are the exact same content type.
This behavior occurs both in the body and the summary.
I have opened the page while running the JS console and I am seeing the following error:
/ckeditor/xss
500 (Internal Server Error)
I do not see this error on the content where the editor is appearing.
Any assistance on this is greatly appreciated! Let me know if I can provide any additional details to help troubleshoot.
Thanks!

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