diff --git a/windows/JackMMCSS.cpp b/windows/JackMMCSS.cpp
index 9ddf0bf2..dc8897df 100644
--- a/windows/JackMMCSS.cpp
+++ b/windows/JackMMCSS.cpp
@@ -1,29 +1,29 @@
-/*
- Copyright (C) 2004-2008 Grame
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- GNU Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-
- */
-
-#include "JackMMCSS.h"
-#include "JackError.h"
+/*
+ Copyright (C) 2004-2008 Grame
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+ */
+
+#include "JackMMCSS.h"
+#include "JackError.h"
 #include <assert.h>
-#include <stdio.h>
-
-namespace Jack
-{
+#include <stdio.h>
+
+namespace Jack
+{
 
 avSetMmThreadCharacteristics JackMMCSS::ffMMCSSFun1 = NULL;
 avSetMmThreadPriority JackMMCSS::ffMMCSSFun2 = NULL;
@@ -31,21 +31,21 @@ avRevertMmThreadCharacteristics JackMMCSS::ffMMCSSFun3 = NULL;
 JACK_HANDLE JackMMCSS::fAvrtDll;
 
 std::map<jack_native_thread_t, HANDLE> JackMMCSS::fHandleTable;
-
-JackMMCSS::JackMMCSS()
-{
+
+JackMMCSS::JackMMCSS()
+{
     fAvrtDll = LoadJackModule("avrt.dll");
 
     if (fAvrtDll != NULL) {
-        ffMMCSSFun1 = (avSetMmThreadCharacteristics)GetJackProc(fAvrtDll, "AvSetMmThreadCharacteristicsA");
+        ffMMCSSFun1 = (avSetMmThreadCharacteristics)GetJackProc(fAvrtDll, "AvSetMmThreadCharacteristicsA");
         ffMMCSSFun2 = (avSetMmThreadPriority)GetJackProc(fAvrtDll, "AvSetMmThreadPriority");
         ffMMCSSFun3 = (avRevertMmThreadCharacteristics)GetJackProc(fAvrtDll, "AvRevertMmThreadCharacteristics");
-    }
-}
-
-JackMMCSS::~JackMMCSS()
-{}
-
+    }
+}
+
+JackMMCSS::~JackMMCSS()
+{}
+
 int JackMMCSS::MMCSSAcquireRealTime(jack_native_thread_t thread)
 {
     if (fHandleTable.find(thread) != fHandleTable.end()) {
@@ -54,23 +54,30 @@ int JackMMCSS::MMCSSAcquireRealTime(jack_native_thread_t thread)
 
     if (ffMMCSSFun1) {
         DWORD dummy = 0;
-        HANDLE task = ffMMCSSFun1("Pro Audio", &dummy);
-        if (task == NULL) {
-            jack_error("Cannot use MMCSS %d", GetLastError());
+        HANDLE task = ffMMCSSFun1("Pro Audio", &dummy);
+        if (task == NULL) {
+            jack_error("AvSetMmThreadCharacteristics error : %d", GetLastError());
         } else if (ffMMCSSFun2(task, AVRT_PRIORITY_CRITICAL)) {
             fHandleTable[thread] = task;
+            jack_log("AvSetMmThreadPriority success");
             return 0;
+        } else {
+            jack_error("AvSetMmThreadPriority error : %d", GetLastError());
         }
      }
 
      return -1;
-}
+}
 
 int JackMMCSS::MMCSSDropRealTime(jack_native_thread_t thread)
 {
     if (fHandleTable.find(thread) != fHandleTable.end()) {
         HANDLE task = fHandleTable[thread];
-        ffMMCSSFun3(task);
+        if (ffMMCSSFun3(task) == 0) {
+            jack_error("AvRevertMmThreadCharacteristics error : %d", GetLastError());
+        } else {
+            jack_log("AvRevertMmThreadCharacteristics success");
+        }
         return 0;
     } else {
         return -1;
diff --git a/windows/JackWinThread.cpp b/windows/JackWinThread.cpp
index 5aa62692..668ca868 100644
--- a/windows/JackWinThread.cpp
+++ b/windows/JackWinThread.cpp
@@ -200,7 +200,7 @@ int JackWinThread::AcquireSelfRealTime(int priority)
 
 int JackWinThread::AcquireRealTimeImp(jack_native_thread_t thread, int priority)
 {
-    jack_log("JackWinThread::AcquireRealTimeImp priority = %d", THREAD_PRIORITY_TIME_CRITICAL);
+    jack_log("JackWinThread::AcquireRealTimeImp priority = %d", priority);
 
     if (priority >= 90 && MMCSSAcquireRealTime(thread) == 0) {
         jack_info("MMCSS API used to acquire RT for thread");