diff --git a/modules/juce_audio_processors/format_types/juce_AudioUnitPluginFormat.mm b/modules/juce_audio_processors/format_types/juce_AudioUnitPluginFormat.mm
index eb471538b2..a072a821f6 100644
--- a/modules/juce_audio_processors/format_types/juce_AudioUnitPluginFormat.mm
+++ b/modules/juce_audio_processors/format_types/juce_AudioUnitPluginFormat.mm
@@ -478,8 +478,8 @@ public:
 
             resetBusses();
 
-            prepared = (AudioUnitInitialize (audioUnit) == noErr);
-            jassert (prepared);
+            jassert (! prepared);
+            initialiseAudioUnit();
         }
     }
 
@@ -499,6 +499,14 @@ public:
         incomingMidi.clear();
     }
 
+    bool initialiseAudioUnit()
+    {
+        if (! prepared)
+            prepared = (AudioUnitInitialize (audioUnit) == noErr);
+
+        return prepared;
+    }
+
     void resetBusses()
     {
         for (int i = 0; i < numInputBusses; ++i)   AudioUnitReset (audioUnit, kAudioUnitScope_Input, i);
@@ -1351,12 +1359,13 @@ private:
 
     bool createView (const bool createGenericViewIfNeeded)
     {
+        if (! plugin.initialiseAudioUnit())
+            return false;
+
         NSView* pluginView = nil;
         UInt32 dataSize = 0;
         Boolean isWritable = false;
 
-        AudioUnitInitialize (plugin.audioUnit);
-
         if (AudioUnitGetPropertyInfo (plugin.audioUnit, kAudioUnitProperty_CocoaUI, kAudioUnitScope_Global,
                                       0, &dataSize, &isWritable) == noErr
              && dataSize != 0
@@ -1523,16 +1532,10 @@ private:
 
             Float32Point pos = { 0, 0 };
             Float32Point size = { 250, 200 };
-
             HIViewRef pluginView = 0;
 
-            AudioUnitCarbonViewCreate (carbonView,
-                                       owner.getAudioUnit(),
-                                       windowRef,
-                                       rootView,
-                                       &pos,
-                                       &size,
-                                       (ControlRef*) &pluginView);
+            AudioUnitCarbonViewCreate (carbonView, owner.getAudioUnit(), windowRef, rootView,
+                                       &pos, &size, (ControlRef*) &pluginView);
 
             return pluginView;
         }