diff --git a/ChangeLog b/ChangeLog
index d28f4b41..08790e40 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -35,6 +35,10 @@ Chris Caudle
   Jackdmp changes log
 ---------------------------
 
+2011-06-28 Stephane Letz  <letz@grame.fr>
+
+	* Correct JackBasePosixMutex::Trylock.
+
 2011-06-26 Stephane Letz  <letz@grame.fr>
 
 	* More robust code in synchronization primitives and in JackMessageBuffer.
diff --git a/macosx/coremidi/JackCoreMidiDriver.cpp b/macosx/coremidi/JackCoreMidiDriver.cpp
index 05a63eb3..bf076ee1 100644
--- a/macosx/coremidi/JackCoreMidiDriver.cpp
+++ b/macosx/coremidi/JackCoreMidiDriver.cpp
@@ -275,7 +275,6 @@ JackCoreMidiDriver::Open(bool capturing, bool playing, int in_channels,
         return -1;
     }
     char *client_name = fClientControl.fName;
-    printf("JackCoreMidiDriver::Open client_name %s\n",client_name);
 
     // Allocate and connect physical inputs
     potential_pi_count = MIDIGetNumberOfSources();
@@ -673,7 +672,7 @@ extern "C" {
                 }
         }
 
-         // singleton kind of driver
+        // singleton kind of driver
         if (!driver) {
             driver = new Jack::JackCoreMidiDriver("system_midi", "coremidi", engine, table);
             if (driver->Open(1, 1, virtual_in, virtual_out, false, "in", "out", 0, 0) == 0) {
diff --git a/posix/JackPosixMutex.h b/posix/JackPosixMutex.h
index 80b32bae..12d98036 100644
--- a/posix/JackPosixMutex.h
+++ b/posix/JackPosixMutex.h
@@ -84,7 +84,6 @@ class JackBasePosixMutex
                     fOwner = current_thread;
                     return true;
                 } else {
-                    jack_error("JackBasePosixMutex::Trylock res = %d", res);
                     return false;
                 }
             } else {