diff --git a/ChangeLog b/ChangeLog
index 34a3b6cf..2e7e3a61 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -24,6 +24,7 @@ Fernando Lopez-Lezcano
 
 	* Use of placement new for dynamic port allocation is possibly not safe... so avoid that until a definitive answer is found.
 	* Cleanup.
+	* JackAudioDriver::ProcessAsync and JackAudioDriver::ProcessSync were broken at some point : 0 has to be returned in all cases.
 
 2008-05-16 Stephane Letz  <letz@grame.fr>
 
diff --git a/common/JackAudioDriver.cpp b/common/JackAudioDriver.cpp
index adc28dd4..90ffb668 100644
--- a/common/JackAudioDriver.cpp
+++ b/common/JackAudioDriver.cpp
@@ -186,14 +186,16 @@ synchronize to the end of client graph execution.
 
 int JackAudioDriver::ProcessAsync()
 {
-    if (Read() < 0) { // Read input buffers for the current cycle
+    // Read input buffers for the current cycle
+    if (Read() < 0) {   
         jack_error("ProcessAsync: read error, skip cycle");
-        return -1;
+        return 0;   // Skip cycle, but continue processing...
     }
 
-    if (Write() < 0) { // Write output buffers from the previous cycle
+    // Write output buffers from the previous cycle
+    if (Write() < 0) {
         jack_error("ProcessAsync: write error, skip cycle");
-        return -1;
+        return 0;   // Skip cycle, but continue processing...
     }
 
     if (fIsMaster) {
@@ -215,9 +217,10 @@ output buffers computed at the *current cycle* are used.
 
 int JackAudioDriver::ProcessSync()
 {
-    if (Read() < 0) { // Read input buffers for the current cycle
+    // Read input buffers for the current cycle
+    if (Read() < 0) { 
         jack_error("ProcessSync: read error, skip cycle");
-        return -1;
+        return 0;   // Skip cycle, but continue processing...
     }
 
     if (fIsMaster) {
@@ -232,9 +235,10 @@ int JackAudioDriver::ProcessSync()
             jack_error("ProcessSync: error");
         }
 
-        if (Write() < 0) { // Write output buffers for the current cycle
+        // Write output buffers for the current cycle
+        if (Write() < 0) { 
             jack_error("ProcessSync: write error, skip cycle");
-            return -1;
+            return 0;   // Skip cycle, but continue processing...
         }
         
     } else {
diff --git a/common/JackDebugClient.cpp b/common/JackDebugClient.cpp
index c3a7a6d5..f527c370 100644
--- a/common/JackDebugClient.cpp
+++ b/common/JackDebugClient.cpp
@@ -427,7 +427,7 @@ int JackDebugClient::SetProcessCallback(JackProcessCallback callback, void *arg)
     CheckClient();
     fProcessTimeCallback = callback;
     fProcessTimeCallbackArg = arg;
-    return  fClient->SetProcessCallback(TimeCallback, this);
+    return fClient->SetProcessCallback(TimeCallback, this);
 }
 
 int JackDebugClient::SetXRunCallback(JackXRunCallback callback, void *arg)