You can also reproduce this by going to the example at...

http://cutesoft.net/example/general.aspx

 

Switch to the HTML code view...

 

Do a find/replace for 'table' and replace with 'TABLE' (Without Match case turned on)...

 

This will get stuck on the Ok/Cancel popup dialog.

 

I'm using Firefox 3.5 under Windows XP Pro SP2