Redirection issue with Domain mapping (for logged in users only)

Hello,

I have a redirection problem for logged in users for the above website. It's exactly the same problem as described at https://premium.wpmudev.org/forums/topic/redirect-loop-when-logged-into-admin-and-slow-site-domainmap-setup-cdsso

It occurred after an update I did of Wordpress and the Domain mapping plugin. Thing is, in the topic I mentioned it said it should be fixed with an update but still the problem persists for me.

Kind regards,

Danny