Make fattn off the default due to vulkan issues

src/AdvancedSettingsDialog.ui

@@ -54,7 +54,7 @@
        <item>
         <widget class="QLabel" name="flashAttentionLabel">
          <property name="text">
-								                                                                             <string>Use flash attention for faster generation. Disable if experiencing issues.</string>
+          <string>Use flash attention for faster generation. Disable if experiencing poor output quality on vulkan.</string>
          </property>
          <property name="wordWrap">
           <bool>true</bool>
@@ -64,7 +64,7 @@
        <item>
         <spacer name="verticalSpacer">
          <property name="orientation">
-							                                     <enum>Qt::Vertical</enum>
+          <enum>Qt::Orientation::Vertical</enum>
          </property>
          <property name="sizeHint" stdset="0">
           <size>

src/MainWindow.cpp

@@ -29,6 +29,7 @@ MainWindow::MainWindow(QWidget *parent)
 	  isGeneratingNext(false)
 {
 	aceStep->moveToThread(&aceThread);
+	aceThread.setObjectName("AceStep Woker Thread");
 
 	ui->setupUi(this);
 
@@ -110,6 +111,8 @@ MainWindow::MainWindow(QWidget *parent)
 MainWindow::~MainWindow()
 {
 	aceStep->cancelGeneration();
+	aceThread.quit();
+	aceThread.wait();
 
 	autoSavePlaylist();
 	saveSettings();
@@ -165,7 +168,7 @@ void MainWindow::loadSettings()
 	aceStep->setLowVramMode(lowVram);
 
 	// Load flash attention setting
-	bool flashAttention = settings.value("flashAttention", true).toBool();
+	bool flashAttention = settings.value("flashAttention", false).toBool();
 	aceStep->setFlashAttention(flashAttention);
 }