Now it's working. I deinstalled the other Textbox component from ActiveUp and since this time, I never had this problem again! Very strange...

 
Now I've an other problem: you wrote "A cross-browser, cross-platform WYSIWYG online HTML editor..." and we bought your component, because a client of us only uses Mac PCs.
And with Mac Safari 2.0 there is a problem, that the text is not shown after roundtrip. Please check my test page again http://www.hhw.de/test. And some Icons and Dropdownlists are missing - also in your examples?!
Or we use Mac FireFox 1.5: here the css inside the box doesn't work i.e. when using "float:right" with images.
Please help!

By the way. When using the "CuteEditorDeveloperGuide.chm" the content in the right area doen't not appear. Do you have any tip for me?

Thanks for help.