Index: generic/xotcl.c
===================================================================
diff -u -rae50f752a447d5302ff8c241be8e4891ce0b4bb7 -rfc6166907f061a71b8a5766441c32080b5cf34f1
--- generic/xotcl.c	(.../xotcl.c)	(revision ae50f752a447d5302ff8c241be8e4891ce0b4bb7)
+++ generic/xotcl.c	(.../xotcl.c)	(revision fc6166907f061a71b8a5766441c32080b5cf34f1)
@@ -6193,7 +6193,14 @@
 				methodName);
       }
 
-      unknown = rst->unknown;
+      if (rst->unknown && (frameType & XOTCL_CSC_TYPE_ACTIVE_FILTER)) {
+	/*fprintf(stderr, "use saved unknown %d frameType %.6x\n", 
+	  RUNTIME_STATE(interp)->unknown, frameType);*/
+	unknown = 1;
+      } else {
+	unknown = 0;
+      }
+
     }
   } else {
     unknown = 1;