I have almost the same problem as this unanswered question. The only difference is I'm using VS2008, but I'm in an MVC project calling this javascript function:

function CompanyChange(compCtrl) {
alert(compCtrl.value);
debugger;
var test;
for (var i = 0; i < document.all.length; i++) {
    test = document.all[i];

}
}

I hit the alert, then I get the message "there is no source code available for the current location." At which point the page becomes unresponsive and I have to manually stop the debugger just to shut it down.

I've logged into another machine and ran this exact code and it works fine, I hit the debugger and can step through. I've checked to make sure all settings in VS>Tools>Options>Debugging are identical as well as IE>Options>Advanced and they are. Both machines are Windows 7 Enterprise edition 32-bit, VS2008, IE8.

I've also tried attaching a process manually in VS, and using the 'Developer Tools' in IE which didn't work (said there already was a process attached).

I was hoping someone may have had this problem and found a work-around because I've already done a lot of searching and tried all the options I've read. Anyone else run into this?

Thank you, Jeff