diff --git a/plugins/VOIP/gui/AudioInputConfig.cpp b/plugins/VOIP/gui/AudioInputConfig.cpp
index d978c59dd..ba97bafb3 100644
--- a/plugins/VOIP/gui/AudioInputConfig.cpp
+++ b/plugins/VOIP/gui/AudioInputConfig.cpp
@@ -276,8 +276,7 @@ void AudioInputConfig::emptyBuffer() {
 }
 
 void AudioInputConfig::on_qpbAudioWizard_clicked() {
-    AudioWizard *aw = new AudioWizard(this);
-    aw->exec();
-    delete aw;
+    AudioWizard aw(this);
+    aw.exec();
     loadSettings();
 }
diff --git a/plugins/VOIP/gui/AudioWizard.cpp b/plugins/VOIP/gui/AudioWizard.cpp
index 38d12c89b..1b75d40da 100644
--- a/plugins/VOIP/gui/AudioWizard.cpp
+++ b/plugins/VOIP/gui/AudioWizard.cpp
@@ -41,11 +41,28 @@
 
 AudioWizard::~AudioWizard()
 {
+    if (ticker) {
+        ticker->stop();
+    }
     if (inputDevice) {
         inputDevice->stop();
+        delete(inputDevice);
+        inputDevice = NULL;
+    }
+    if (inputProcessor) {
+        inputProcessor->close();
+        delete(inputProcessor);
+        inputProcessor = NULL;
     }
     if (outputDevice) {
         outputDevice->stop();
+        delete(outputDevice);
+        outputDevice = NULL;
+    }
+    if (outputProcessor) {
+        outputProcessor->close();
+        delete(outputProcessor);
+        outputProcessor = NULL;
     }
 }
 
diff --git a/plugins/VOIP/gui/SpeexProcessor.cpp b/plugins/VOIP/gui/SpeexProcessor.cpp
index cc764f9f8..d159cc55d 100644
--- a/plugins/VOIP/gui/SpeexProcessor.cpp
+++ b/plugins/VOIP/gui/SpeexProcessor.cpp
@@ -95,7 +95,9 @@ SpeexInputProcessor::SpeexInputProcessor(QObject *parent) : QIODevice(parent),
     }
 
 SpeexInputProcessor::~SpeexInputProcessor() {
+    if (preprocessor) {
         speex_preprocess_state_destroy(preprocessor);
+    }
         if (echo_state) {
            speex_echo_state_destroy(echo_state);
         }
diff --git a/retroshare-gui/src/gui/settings/AppearancePage.cpp b/retroshare-gui/src/gui/settings/AppearancePage.cpp
index 549ef19f5..3f1bb0295 100755
--- a/retroshare-gui/src/gui/settings/AppearancePage.cpp
+++ b/retroshare-gui/src/gui/settings/AppearancePage.cpp
@@ -62,8 +62,10 @@ AppearancePage::AppearancePage(QWidget * parent, Qt::WFlags flags)
 
 AppearancePage::~AppearancePage()
 {
-	/* reaload style sheet */
-	Rshare::loadStyleSheet(Settings->getSheetName());
+	if (wasLoaded()) {
+		/* reaload style sheet */
+		Rshare::loadStyleSheet(Settings->getSheetName());
+	}
 }
 
 /** Saves the changes on this page */