PROBLEM Forbidden You don't have permission to access this resource

[Felix]

Hi

The GS cms error reporter did not show anything usable to solve the problem.
Make sure you comment it again: #define('GSDEBUG', TRUE);

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About flevoland2020.nl

Your domain flevoland2020.nl where the pictures work normally uses a ssl certificate from Sectigo
and all website content resolves correctly to https://

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About ja21flevoland.nl

It looks like your domain ja21flevoland.nl uses a ssl certificate from Let's Encrypt but I am not sure
but the domain does not resolve to https://
The hostname ja21flevoland.nl does NOT match the Common Name in the certificate

If a Let's Encrypt certificate or another certificate is used for that domain
then you should check if it is setup correctly or contact your hosting support

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After you solved the ssl certificate with ja21flevoland.nl
check the image urls inside the CKEditor

http://ja21flevoland.nl/data/uploads/ja21-logo.png

Yes the image shows up with the above url directly in the browser.

The GS cms uses the CKEditor for editing text and including images.
Check the image urls how they are linked in the the CKEditor.