I am using the latest version... both in my app as well as your online sample which Adam linked me too (on your site).  I cannot control my user's actions (since they are using the editor to edit their own pages)

 

 

I am using IE 7.0 - and double verified that it occurs with Firefox as well.

 

Before:

 <link ID="pdCSS" RUNAT="Server" HREF="portal.css" TYPE="text/css" REL="stylesheet"/>

 

After:

 <link ID="pdCSS" RUNAT="Server" HREF="portal.css" TYPE="text/css" REL="stylesheet"/ />

 

D.