This error message is quite odd and we have not received such reports so far. Could you confirm whether you are using the latest build of WebTextEditor 1.0 and WebUI.NET Framework.NET 3.0. I tried to reproduce the problem in my local test by creating a simple sample of WebSpellChecker that points to an ASP.NET TextBox and show the dialog box of WebSpellChecker, but my efforts were not successful – the dialog box is rendered in a correct size (not too small) and the “Done” button was accessed without any issues.

I’m willing to advice you further but in order to do so I would need you to elaborate on your specific scenario and possibly send us a running simple sample that reproduces the issue and step-by-step guide that we can use to observe the problematic behavior.

For your information, I’m testing the issue using WebTextEditor 1.0 build 33 and WebUI.NET Framework.NET 3.0 build 770.