@keneda Thanks for that. Since my last message I have another log for comparison from just a moment ago when Contacts opened normally. Unfortunately Pastebin is bombarding me with cookies and advertisements that are difficult to eliminate so I refuse to use it. I'll look for another way to present the logs.

@john-sarghaff It should be in the OpenStore. Have you made sure all the updates are installed from there? Check Updates in System Settings if still no joy. After that I would either swop update channels from system msettings or re run through the installer.