Aha! We fixed it. The 403 forbidden got me thinking… maybe the WordFence Firewall is blocking it. And it was. :)
I set the Firewall to learning mode and the issue was resolved.
Hi Victoria,
Thanks for the suggestion. We changed the php configuration and default-constants to the suggested values, but no change.
You can check the settings with the WP Server Stats plugin.
Is there something else we can try?
Thanks.
Best regards,
Bas van de Ree
Juradon