Because of a problem trying to install Autokey on Leap 15 (see https://forums.opensuse.org/showthread.php/531542-Autokey-and-python-sip-api-mismatch) I tried updating KDE to the latest version (from https://en.opensuse.org/SDB:KDE_repositories). After this kmail no longer displays messages, just a white blank in both the preview pane and when the message is opened. The text of the message displays in a reply composer window and in the message source.
Starting kmail or kontact in terminal I get this whenever I select a message:
**** **1 : "Uncaught ReferenceError: qt is not defined"** **1 : "Uncaught ReferenceError: qt is not defined"**
Anyone else seen this problem? Any advice for fixing? It seems there is a bug report for this already: https://bugs.kde.org/show_bug.cgi?id=394885 and here https://bugs.archlinux.org/task/57700. It seems the problem is with qt.