--- a/roundup/cgi/templating.py	Wed Oct 02 15:36:34 2013 +0200
+++ b/roundup/cgi/templating.py	Mon Oct 07 19:29:33 2013 -0400
@@ -1159,7 +1159,12 @@
         }
         for name in self._props.keys():
             if name not in exclude:
-                query[name] = self[name].plain()
+                prop = self._props[name]
+                if not isinstance(prop, hyperdb.Multilink):
+                    query[name] = self[name].plain()
+                else:
+                    query[name] = ",".join(self._klass.get(self._nodeid, name))
+
         return self._classname + "?" + "&".join(
             ["%s=%s" % (key, urllib.quote(value))
                 for key, value in query.items()])