[O] hyperlinks stopped working

[Russell L. Carter]

Hi,

org-version is 8.3.3-26-ge92a06-elpa, emacs is 25.0.50.1 on FreeBSD
stable.  Hyperlinks on my unchanged configuration just stopped
working, and display as the literal string.  Neither
org-toggle-link-display nor font-lock-mode has any effect.  I see
these in the Messages buffer:

Error during redisplay: (jit-lock-function 1) signaled 
(wrong-type-argument listp org-level-1)
Error during redisplay: (jit-lock-function 1780) signaled 
(wrong-type-argument listp org-level-1)

I'm using the emacs package manager.  I tried deleting org and reinstalling
a fresh copy to no effect.

Here's my entire configuration:

(use-package org
                         :config
                         (setq org-directory "~")
                         (setq org-agenda-files '("~/org/TODO.org"))
                         (setq org-mobile-files 
'("~/org/mobile-staging-public"))
                         (setq org-mobile-directory 
"~/org/mobile-staging-private")
                         (setq org-mobile-inbox-for-pull 
"~/org/from-mobile.org")

                         :mode
                         ("\\.text\\'" . org-mode)
                         ("\\.markdown\\'" . org-mode)
                         ("\\.md\\'" . org-mode))


Any clues as to what might be wrong would be appreciated.

Thanks!
Russell