Sorry about the late response, gut hung up on some things.
Ok, I can not reproduce your error in VWD using the method you described earlier.
Couple of things, in your web.config do you have this line:
<
compilation debug="true">
and also do you have the CustomErrors tag set to "Off"?
Have you tried accessing the site from directly in IE as opposed to clicking view in browser? (The development server must be running which is denoted by the icon in your system tray)