diff --git a/kcc/KCC_gui.py b/kcc/KCC_gui.py
index c387b98..0b80e94 100644
--- a/kcc/KCC_gui.py
+++ b/kcc/KCC_gui.py
@@ -228,8 +228,10 @@ class WorkerThread(QtCore.QThread):
                             continue
                         if not self.conversionAlive:
                             for item in outputPath:
-                                os.remove(item)
-                                os.remove(item.replace('.epub', '.mobi'))
+                                if os.path.exists(item):
+                                    os.remove(item)
+                                if os.path.exists(item.replace('.epub', '.mobi')):
+                                    os.remove(item.replace('.epub', '.mobi'))
                             self.clean()
                             return
                         if self.kindlegenErrorCode == 0:
@@ -532,8 +534,15 @@ class Ui_KCC(object):
     def hideProgressBar(self):
         GUI.ProgressBar.hide()
 
-    # noinspection PyUnusedLocal
     def saveSettings(self, event):
+        if self.conversionAlive:
+            GUI.ConvertButton.setEnabled(False)
+            self.addMessage('Process will be interrupted. Please wait.', 'warning')
+            self.conversionAlive = False
+            self.worker.sync()
+            event.ignore()
+        if not GUI.ConvertButton.isEnabled():
+            event.ignore()
         self.settings.setValue('lastPath', self.lastPath)
         self.settings.setValue('lastDevice', GUI.DeviceBox.currentIndex())
         self.settings.setValue('currentFormat', GUI.FormatBox.currentIndex())
diff --git a/kcc/comic2ebook.py b/kcc/comic2ebook.py
index 97c32f4..b3cbacb 100755
--- a/kcc/comic2ebook.py
+++ b/kcc/comic2ebook.py
@@ -364,7 +364,7 @@ def dirImgProcess(path):
                     pass
                 if not GUI.conversionAlive:
                     pool.terminate()
-                    rmtree(path)
+                    rmtree(os.path.join(path, '..', '..'))
                     raise UserWarning("Conversion interrupted.")
                 GUI.emit(QtCore.SIGNAL("progressBarTick"))
         pool.join()
@@ -372,7 +372,7 @@ def dirImgProcess(path):
         try:
             splitpages = splitpages.get()
         except:
-            rmtree(path)
+            rmtree(os.path.join(path, '..', '..'))
             raise RuntimeError("One of workers crashed. Cause: " + str(sys.exc_info()[1]))
         splitpages = filter(None, splitpages)
         splitpages.sort()
@@ -382,7 +382,7 @@ def dirImgProcess(path):
                 pagenumbermodifier += 1
             pagenumbermodifier += 1
     else:
-        rmtree(path)
+        rmtree(os.path.join(path, '..', '..'))
         raise UserWarning("Source directory is empty.")
 
 
diff --git a/kcc/comic2panel.py b/kcc/comic2panel.py
index dc3bae0..8111c13 100644
--- a/kcc/comic2panel.py
+++ b/kcc/comic2panel.py
@@ -255,7 +255,7 @@ def main(argv=None, qtGUI=None):
                 try:
                     workers.get()
                 except:
-                    rmtree(options.targetDir)
+                    rmtree(options.targetDir, True)
                     raise RuntimeError("One of workers crashed. Cause: " + str(sys.exc_info()[1]))
                 if GUI:
                     GUI.emit(QtCore.SIGNAL("progressBarTick"), 1)