Thanks Chuck... You certainly pointed me in the right direction. To correct this error I had to edit two of the vb3enhanced templates.
The Form "vbform" is doing return validation of 'this.subject.value'. The reason I am getting the error is that the suggested hidden field doen't exist in quikcom.tmpl.
The quickcom.tmpl did not include the hidden form field for subject so I copied it just below the <form> open. This corrected the javascript error.
I was also receiving this error from comments.php. I changed the placement of the hidden field so it would also follow the <form> open and the error went away.
There is also a javascript error if a member attempts to submit a duplicate comment. I haven't figured this one out as the error is kind of vague.