Hello,
I'm not against sending you the credentials, but I'm having the same problem on all sites that use joomla 4.1. I don't think I'm alone in this case.
The issue appear since the 4.0.6 to 4.1 update, because the template.css path has changed to media folder.
The editor no longer find the styles of the template.css file by default, you have to give it the new path to it into the JCE global configuration. This manipulation works, except for titles and links that do not display the right color. Am I understandable?
Thanks,
Regards.