diff --git a/Assets/uDesktopDuplication/Scripts/Manager.cs b/Assets/uDesktopDuplication/Scripts/Manager.cs
index 3b42ded..06065fc 100644
--- a/Assets/uDesktopDuplication/Scripts/Manager.cs
+++ b/Assets/uDesktopDuplication/Scripts/Manager.cs
@@ -115,7 +115,7 @@ public class Manager : MonoBehaviour
     [ContextMenu("Reinitialize")]
     void Reinitialize()
     {
-        Debug.Log("[uDesktopDuplication] Reinitialize");
+        Debug.Log("[uDD] Reinitialize");
         Lib.Reinitialize();
         CreateMonitors();
         if (onReinitialized != null) {
diff --git a/Assets/uDesktopDuplication/Scripts/Monitor.cs b/Assets/uDesktopDuplication/Scripts/Monitor.cs
index c8ef34b..2fb68b6 100644
--- a/Assets/uDesktopDuplication/Scripts/Monitor.cs
+++ b/Assets/uDesktopDuplication/Scripts/Monitor.cs
@@ -13,23 +13,27 @@ public class Monitor
         switch (state)
         {
             case MonitorState.InvalidArg:
-                Debug.LogErrorFormat("[{0}:{1}] Invalid.", id, name);
+                Debug.LogErrorFormat("[uDD] {0}:{1} => Invalid.", id, name);
                 break;
             case MonitorState.AccessDenied:
-                Debug.LogErrorFormat("[{0}:{1}] Access Denied.", id, name);
+                Debug.LogErrorFormat("[uDD] {0}:{1} => Access Denied.", id, name);
                 break;
             case MonitorState.Unsupported:
-                Debug.LogErrorFormat("[{0}:{1}] Unsupported.", id, name);
+                Debug.LogErrorFormat("[uDD] {0}:{1} => Unsupported.", id, name);
                 break;
             case MonitorState.SessionDisconnected:
-                Debug.LogErrorFormat("[{0}:{1}] Disconnected.", id, name);
+                Debug.LogErrorFormat("[uDD] {0}:{1} => Disconnected.", id, name);
                 break;
             case MonitorState.NotSet:
-                Debug.LogErrorFormat("[{0}:{1}] Something wrong.", id, name);
+                Debug.LogErrorFormat("[uDD] {0}:{1} => Something wrong.", id, name);
                 break;
             default:
                 break;
         }
+
+        if (dpiX == 0 || dpiY == 0) {
+            Debug.LogWarningFormat("[uDD] {0}:{1} => Could not get DPI", id, name);
+        }
     }
 
     public int id