Hi Joe,
Thank you very much for your fast answer.
In the meantime I had an other error when I tried to install the RadEditorProvider extension. When I clicked on Install Extension Wizard, nothing happened and I had an Error on page warning. When I clicked on details, I found this error: "dnnModal is undefined", so I found this solution to it:
http://www.dotnetnuke.com/Resources...posts.aspx I copied the Debug folder from the DNN install package to my website and it showed up the Install Extension Wizard in a modal window.
After I installed the RadEditorProvider package, I found at the hosts items under "HTML Editor Manager", that we were using the "Telerik Editor Provider".
I changed to DotNetNuke.RadEditorProvider, but actually I like the Telerik Editor better, it seems to have more options.
So do you think that the problem was with the Debug folder missing? Since I am not using the RadEditorProvider and now the Edit Content still works.
In any case you pointed me to the right direction.
Thank you very much,
Steven