Yes. You need to click hyperlink text/keyword contained in the preview window.

Again i'll repeat,

Steps to reproduce the same using below links,
http://cutesoft.net/example/general.aspx
http://www.cutesoft.net/forums/AddPost.aspx

Click anyone of the above link.  Type some contents in cute editor -> select a text/keyword -> click Hyperlink button in toolbar -> browse to select a html page -> select "watch.htm" -> click preview button to view the source in content -> in preview state/window ->  click anyone of the text/keyword hyperlink then -> click normal/html button to see javascript error.