From mboxrd@z Thu Jan  1 00:00:00 1970
From: Peter Westlake <peter.westlake@pobox.com>
Subject: Org mode fontification broken
Date: Mon, 12 Nov 2018 14:52:30 +0000
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Since upgrading from Fedora 27 to Fedora 28, Emacs 26.1-3.fc28.x86_64, links and other fontified text in Org files appear as the underlying plain text. A few of them look correct, and deleting a marker character (e.g. square bracket) and reinserting it makes the link appear correctly for a while. The Messages buffer is full of things like this:

Error during redisplay: (jit-lock-function 501) signaled (wrong-type-argument listp org-level-4)
Error during redisplay: (jit-lock-function 1001) signaled (wrong-type-argument listp org-level-4)
Error during redisplay: (jit-lock-function 1501) signaled (wrong-type-argument listp org-level-3)
Error during redisplay: (jit-lock-function 2001) signaled (wrong-type-argument listp org-level-3)
Error during redisplay: (jit-lock-function 1152403) signaled (wrong-type-argument listp org-level-2)

I've attempted to set jit-lock-mode to nil in .emacs, with no success.

This Emacs has a built-in version of Org, 9.1.14, and I've tried 20181125 installed through Melpa. Nothing makes a difference.
 
Any ideas?

Peter.