Hi,

 

thank you for your help!

 

I now found out what I did wrong: I was already using the latest build, but when installing it I had followed the instructions under http://cutesoft.net/ASP.NET+WYSIWYG+Editor/Deployment/default.aspx 
The instructions say that it is necessary to copy 2 of the downloaded dll files to the applications /bin directory.

When installing the second time I copied all the entire downloaded /bin into the /bin directory of my application. It now works.

This also solved my trouble not being able to use the emotion icons.