The 'Request Vars' tab of the panel displays the passed arguments and…

… thus it was displaying the form as it is: rendering it.

debug_toolbar/panels/request_vars.py

@@ -41,6 +41,9 @@ def process_response(self, request, response):
         try:
             match = resolve(self.request.path)
             func, args, kwargs = match
+            # Converting the objects to its string representation
+            args = tuple(['%s'%arg for arg in args])
+            kwargs = dict([(key, '%s'%arg) for (key, arg) in kwargs.iteritems()])
             view_info['view_func'] = get_name_from_obj(func)
             view_info['view_args'] = args
             view_info['view_kwargs'] = kwargs