Index: generic/nsf.c
===================================================================
diff -u -r86becbe05373b722fe093ffe5a4a1c19d1ebd76d -r4e48f1044506977558e55e4e40138cf876b9609f
--- generic/nsf.c	(.../nsf.c)	(revision 86becbe05373b722fe093ffe5a4a1c19d1ebd76d)
+++ generic/nsf.c	(.../nsf.c)	(revision 4e48f1044506977558e55e4e40138cf876b9609f)
@@ -13294,6 +13294,47 @@
     subMethodCmd = NULL;
   }
 
+#if 1
+  if (subMethodCmd != NULL) {
+    unsigned long cmdFlags = (unsigned long)Tcl_Command_flags(subMethodCmd);
+    if (unlikely((cmdFlags & NSF_CMD_CALL_PROTECTED_METHOD) != 0u)) {
+      NsfObject *lastSelf;
+      Tcl_CallFrame *framePtr;
+      int withinEnsemble = ((cscPtr->frameType & NSF_CSC_TYPE_ENSEMBLE) != 0u);
+      
+      if (withinEnsemble) {
+        Tcl_CallFrame *framePtr1;
+        /* Alternatively: (void)NsfCallStackFindLastInvocation(interp, 0, &framePtr1); */
+        (void)CallStackGetTopFrame(interp, &framePtr);
+        (void)CallStackFindEnsembleCsc(framePtr, &framePtr1);
+        /* NsfShowStack(interp);
+           fprintf(stderr, "framePtr %p\n", framePtr1);*/
+        if (framePtr1 != NULL) {
+          lastSelf = GetSelfObj2(interp, framePtr1);
+        } else {
+          lastSelf = NULL;
+        }
+      } else {
+        lastSelf = GetSelfObj(interp);
+      }
+      
+      
+      /* fprintf(stderr, "'%s (%s) == %s == %s? for %s\n", lastSelf != NULL ? ObjectName(lastSelf): "n/a", 
+              ObjectName(GetSelfObj(interp)), ObjectName(actualSelf), ObjectName(invokedObject), subMethodName); */
+      
+      if (actualSelf != lastSelf) {
+        const char *path = withinEnsemble ? ObjStr(NsfMethodNamePath(interp, framePtr, methodName)) : methodName;
+        
+        NsfLog(interp, NSF_LOG_WARN, "'%s %s %s' fails since method %s.%s %s is protected",
+               ObjectName(actualSelf), path, subMethodName, (actualClass != NULL) ?
+               ClassName(actualClass) : ObjectName(actualSelf), path, subMethodName);
+        subMethodCmd = NULL;
+      }
+    }
+  }
+#endif
+
+
   /*
    * Make sure, that the current call is marked as an ensemble call, both
    * for dispatching to the default-method and for dispatching the method
Index: generic/nsfStack.c
===================================================================
diff -u -r5b6d88f867023b304dd16a7d23895d5c80ae606e -r4e48f1044506977558e55e4e40138cf876b9609f
--- generic/nsfStack.c	(.../nsfStack.c)	(revision 5b6d88f867023b304dd16a7d23895d5c80ae606e)
+++ generic/nsfStack.c	(.../nsfStack.c)	(revision 4e48f1044506977558e55e4e40138cf876b9609f)
@@ -316,9 +316,11 @@
 
 /*
  *----------------------------------------------------------------------
- * GetSelfObj --
+ * GetSelfObj, GetSelfObj2 --
  *
- *    Return the currently active object from a method or object frame.
+ *    Return the corresponding object from a method or from an object
+ *    frame. GetSelfObj defaults to the top-most callframe, GetSelfObj2 allows
+ *    one to set another frame.
  *
  * Results:
  *    NsfObject * or NULL.
@@ -338,6 +340,10 @@
 # endif
 #endif
 
+#define GetSelfObj(interp) \
+  GetSelfObj2((interp), (Tcl_CallFrame *)Tcl_Interp_varFramePtr((interp)))
+
+#if 0
 NSF_INLINE static NsfObject* GetSelfObj(const Tcl_Interp *interp) nonnull(1);
 
 NSF_INLINE static NsfObject*
@@ -377,7 +383,48 @@
   }
   return NULL;
 }
+#endif
 
+NSF_INLINE static NsfObject* GetSelfObj2(const Tcl_Interp *interp, Tcl_CallFrame *framePtr) nonnull(1) nonnull(2);
+
+NSF_INLINE static NsfObject*
+GetSelfObj2(const Tcl_Interp *interp, Tcl_CallFrame *framePtr) {
+  register Tcl_CallFrame *varFramePtr;
+
+  nonnull_assert(interp != NULL);
+
+  /*fprintf(stderr, "GetSelfObj interp has frame %p and var-frame %p\n",
+    Tcl_Interp_framePtr(interp), Tcl_Interp_varFramePtr(interp));*/
+
+  for (varFramePtr = framePtr;
+       varFramePtr != NULL;
+       varFramePtr =
+#if defined(SKIP_LEVELS)
+                        Tcl_CallFrame_callerPtr(varFramePtr)
+#else
+                        NULL
+#endif
+                        ) {
+    register unsigned int flags;
+
+    flags = (unsigned int)Tcl_CallFrame_isProcCallFrame(varFramePtr);
+    if (likely((flags & (FRAME_IS_NSF_METHOD|FRAME_IS_NSF_CMETHOD)) != 0u)) {
+      return ((NsfCallStackContent *)Tcl_CallFrame_clientData(varFramePtr))->self;
+
+    } else if ((flags & FRAME_IS_NSF_OBJECT) != 0u) {
+      return (NsfObject *)Tcl_CallFrame_clientData(varFramePtr);
+      
+    }
+#if defined(SKIP_LAMBDA)
+    if ((flags & FRAME_IS_LAMBDA) != 0u) {
+      continue;
+    }
+    break;
+#endif
+  }
+  return NULL;
+}
+
 /*
  *----------------------------------------------------------------------
  * CallStackGetTclFrame --
Index: tests/protected.test
===================================================================
diff -u -r371cc41c32db500cb1d5bcab139ef65299ef4d6c -r4e48f1044506977558e55e4e40138cf876b9609f
--- tests/protected.test	(.../protected.test)	(revision 371cc41c32db500cb1d5bcab139ef65299ef4d6c)
+++ tests/protected.test	(.../protected.test)	(revision 4e48f1044506977558e55e4e40138cf876b9609f)
@@ -868,6 +868,135 @@
   ? {C private object property {d:integer 1}} {'property' is not a method defining method}
 }
 
+nx::test case protected-ensembles {
+
+  set ::o [nx::Object new {
+    set ::foo2faa [:protected object method "foo2 faa" {} {return protected}]
+    ? [list set _ [:foo2 faa]] "protected"
+    
+    set ::foo2baz [:public object method "foo2 baz" {} {:foo2 faa}]
+    ? [list set _ [:foo2 baz]] "protected"
+
+    :object method m1 {} {:foo2 faa}
+    ? [list set _ [:m1]] "protected"
+
+    :object method m2 {} {apply {{} {:foo2 faa}}}
+    ? [list set _ [:m2]] "protected"
+
+    set ::foo2biz [:public object method "foo2 biz" {} {apply {{} {:foo2 faa}}}]
+    ? [list set _ [:foo2 biz]] "protected"
+
+  }]
+
+  ? {$::o foo2 faa fee} "unable to dispatch sub-method \"faa\" of $::o foo2; valid are: foo2 baz, foo2 biz"
+
+  set C [nx::Class new {
+    set ::foo2faa [:protected method "foo2 faa" {} {return protected}]
+    set ::foo2baz [:public method "foo2 baz" {} {:foo2 faa}]
+
+    set c [:new {
+      ? [list set _ [:foo2 faa]] "protected"
+    }]
+
+    ? [list set _ [$c foo2 baz]] "protected"
+
+    :public method m1 {} {:foo2 faa}
+    ? [list set _ [$c m1]] "protected"
+
+    :public method m2 {} {apply {{} {:foo2 faa}}}
+    ? [list set _ [$c m2]] "protected"
+
+    set ::foo2biz [:public method "foo2 biz" {} {apply {{} {:foo2 faa}}}]
+    ? [list set _ [$c foo2 biz]] "protected"
+
+    ? [list $c foo2 faa] "unable to dispatch sub-method \"faa\" of $c foo2; valid are: foo2 baz, foo2 biz"
+
+    set mixin [nx::Class new {
+      :public method m3 {} {
+        :foo2 faa
+      }
+      :public method "foo2 fee" {} {
+        :foo2 faa
+      }
+      :public method "foo2 faa" {} {
+        next
+      }
+    }]
+
+    $c object mixins add $mixin
+    ? [list set _ [$c m3]] "protected"
+    ? [list set _ [$c foo2 fee]] "protected"
+    ? [list set _ [$c foo2 faa]] "protected"
+    $c object mixins clear
+    ? [list $c foo2 faa] "unable to dispatch sub-method \"faa\" of $c foo2; valid are: foo2 baz, foo2 biz"
+    
+  }]
+
+  # ensemble
+  set ::o [nx::Object new {
+    set ::foo2faa [:protected object method "foo2 faa fee" {} {return protected}]
+    ? [list set _ [:foo2 faa fee]] "protected"
+
+    set ::foo2baz [:public object method "foo2 baz" {} {:foo2 faa fee}]
+    ? [list set _ [:foo2 baz]] "protected"
+
+    :object method m1 {} {:foo2 faa fee}
+    ? [list set _ [:m1]] "protected"
+
+    :object method m2 {} {apply {{} {:foo2 faa fee}}}
+    ? [list set _ [:m2]] "protected"
+
+    set ::foo2biz [:public object method "foo2 biz" {} {apply {{} {:foo2 faa fee}}}]
+    ? [list set _ [:foo2 biz]] "protected"
+
+  }]
+
+  ? {$::o foo2 faa fee} "unable to dispatch sub-method \"fee\" of $::o foo2 faa; valid are: "
+
+  set ::C [nx::Class new {
+    set ::foo2faa [:protected method "foo2 faa fim" {} {return protected}]
+    set ::foo2baz [:public method "foo2 baz" {} {:foo2 faa fim}]
+
+    set c [:new {
+      ? [list set _ [:foo2 faa fim]] "protected"
+    }]
+
+    ? [list set _ [$c foo2 baz]] "protected"
+
+    :public method m1 {} {:foo2 faa fim}
+    ? [list set _ [$c m1]] "protected"
+
+    :public method m2 {} {apply {{} {:foo2 faa fim}}}
+    ? [list set _ [$c m2]] "protected"
+
+    set ::foo2biz [:public method "foo2 biz" {} {apply {{} {:foo2 faa fim}}}]
+    ? [list set _ [$c foo2 biz]] "protected"
+
+    ? [list $c foo2 faa fim] "unable to dispatch sub-method \"fim\" of $c foo2 faa; valid are: "
+
+    set mixin [nx::Class new {
+      :public method m3 {} {
+        :foo2 faa fim
+      }
+      :public method "foo2 fee fuu" {} {
+        :foo2 faa fim
+      }
+      :public method "foo2 faa fim" {} {
+        next
+      }
+    }]
+
+    $c object mixins add $mixin
+    ? [list set _ [$c m3]] "protected"
+    ? [list set _ [$c foo2 fee fuu]] "protected"
+    ? [list set _ [$c foo2 faa fim]] "protected"
+    $c object mixins clear
+    ? [list $c foo2 faa fim] "unable to dispatch sub-method \"fim\" of $c foo2 faa; valid are: "
+    
+  }]
+}
+
+
 #
 # Local variables:
 #    mode: tcl