I recreated the problem on a test site using same content and imported MySQL db, same plugins, same theme. Then I disabled all plugins other than eShop, tried the default themes (twenty-twelve, twenty-eleven, twenty-ten) one by one, and the error persists…
How can I be helpful?
Errors are appearing on these pages:
wp-admin/upload.php
wp-admin/edit.php
wp-admin/edit.php?post_type=page
I’m not a member of Quirm.net, and I’m not using multi-site. Thanks for the attention to the issue. We’re still operational on 6.3.5.