diff --git a/src/calibre/gui2/actions/choose_library.py b/src/calibre/gui2/actions/choose_library.py
index d3045fecf4..2f8beab976 100644
--- a/src/calibre/gui2/actions/choose_library.py
+++ b/src/calibre/gui2/actions/choose_library.py
@@ -217,7 +217,6 @@ class ChooseLibraryAction(InterfaceAction):
     def backup_status(self, location):
         dirty_text = 'no'
         try:
-            print 'here'
             dirty_text = \
                   unicode(self.gui.library_view.model().db.dirty_queue_length())
         except:
diff --git a/src/calibre/gui2/dialogs/metadata_bulk.py b/src/calibre/gui2/dialogs/metadata_bulk.py
index 4fc85f2b30..347ed36d7c 100644
--- a/src/calibre/gui2/dialogs/metadata_bulk.py
+++ b/src/calibre/gui2/dialogs/metadata_bulk.py
@@ -82,8 +82,9 @@ class MyBlockingBusy(QDialog):
                     self.db.commit()
                     return self.accept()
             id = self.ids[self.current_index]
+            percent = int((self.current_index*100)/float(len(self.ids)))
             self.msg.setText(self.msg_text.format(self.phases[self.current_phase],
-                                        (self.current_index*100)/len(self.ids)))
+                                        percent))
             self.do_one(id)
         except Exception, err:
             import traceback
@@ -168,6 +169,7 @@ class MyBlockingBusy(QDialog):
             self.current_index = len(self.ids)
         elif self.current_phase == 4:
             self.s_r_func(id)
+            self.current_index = len(self.ids)
         # do the next one
         self.current_index += 1
         self.do_one_signal.emit()
@@ -658,12 +660,6 @@ class MetadataBulkDialog(QDialog, Ui_MetadataBulkDialog):
                 do_remove_conv, do_auto_author, series, do_series_restart,
                 series_start_value, do_title_case, clear_series)
 
-#        bb = BlockingBusy(_('Applying changes to %d books. This may take a while.')
-#                %len(self.ids), parent=self)
-#        self.worker = Worker(args, self.db, self.ids,
-#                getattr(self, 'custom_column_widgets', []),
-#                Dispatcher(bb.accept, parent=bb))
-
         bb = MyBlockingBusy(_('Applying changes to %d books.\nPhase {0} {1}%%.')
                 %len(self.ids), args, self.db, self.ids,
                 getattr(self, 'custom_column_widgets', []),
@@ -673,7 +669,6 @@ class MetadataBulkDialog(QDialog, Ui_MetadataBulkDialog):
         # which can slow down bulk editing of large numbers of books
         self.model.stop_metadata_backup()
         try:
-#            self.worker.start()
             bb.exec_()
         finally:
             self.model.start_metadata_backup()
diff --git a/src/calibre/gui2/preferences/plugboard.ui b/src/calibre/gui2/preferences/plugboard.ui
index efe500aebd..6329a78ce1 100644
--- a/src/calibre/gui2/preferences/plugboard.ui
+++ b/src/calibre/gui2/preferences/plugboard.ui
@@ -19,7 +19,7 @@
      <property name="text">
       <string>Here you can change the metadata calibre uses to update a book when saving to disk or sending to device.
 
-Use this dialog to define a 'plugboard' for for a format (or all formats) and a device (or all devices). The plugboard spefies what template is connected to what field. The template is used to find compute a value, and that value is assigned to the connected field.
+Use this dialog to define a 'plugboard' for for a format (or all formats) and a device (or all devices). The plugboard spefies what template is connected to what field. The template is used to compute a value, and that value is assigned to the connected field.
 
 Often templates will contain simple references to composite columns, but this is not necessary. You can use any template in a source box that you can use elsewhere in calibre.
 
diff --git a/src/calibre/library/caches.py b/src/calibre/library/caches.py
index 42720c5e83..0c3904532e 100644
--- a/src/calibre/library/caches.py
+++ b/src/calibre/library/caches.py
@@ -151,17 +151,26 @@ class CoverCache(Thread): # {{{
                         ids.add(id_)
                 except Empty:
                     pass
+                except:
+                    # Happens during shutdown
+                    break
             except Empty:
                 continue
             except:
                 #Happens during interpreter shutdown
                 break
+            if not self.keep_running:
+                break
             for id_ in ids:
                 time.sleep(0.050) # Limit 20/second to not overwhelm the GUI
                 try:
                     img = self._image_for_id(id_)
                 except:
-                    traceback.print_exc()
+                    try:
+                        traceback.print_exc()
+                    except:
+                        # happens during shutdown
+                        break
                     continue
                 try:
                     with self.lock:
diff --git a/src/calibre/library/database2.py b/src/calibre/library/database2.py
index 85fb955448..08dd74af29 100644
--- a/src/calibre/library/database2.py
+++ b/src/calibre/library/database2.py
@@ -528,11 +528,6 @@ class LibraryDatabase2(LibraryDatabase, SchemaUpgrade, CustomColumns):
             try:
                 f = open(path, 'rb')
             except (IOError, OSError):
-                try:
-                    f.close()
-                    print 'cover exception left file open!', path
-                except:
-                    pass
                 time.sleep(0.2)
                 f = open(path, 'rb')
             if as_image:
diff --git a/src/calibre/library/save_to_disk.py b/src/calibre/library/save_to_disk.py
index 113ebf823a..afeb5ee0b9 100644
--- a/src/calibre/library/save_to_disk.py
+++ b/src/calibre/library/save_to_disk.py
@@ -17,7 +17,7 @@ from calibre.ebooks.metadata.meta import set_metadata
 from calibre.constants import preferred_encoding, filesystem_encoding
 from calibre.ebooks.metadata import fmt_sidx
 from calibre.ebooks.metadata import title_sort
-from calibre import strftime, prints
+from calibre import strftime
 
 plugboard_any_device_value = 'any device'
 plugboard_any_format_value = 'any format'
@@ -259,7 +259,7 @@ def save_book_to_disk(id, db, root, opts, length):
                 cpb = cpb[dev_name]
             else:
                 cpb = None
-        prints('Using plugboard:', fmt, cpb)
+        #prints('Using plugboard:', fmt, cpb)
         data = db.format(id, fmt, index_is_id=True)
         if data is None:
             continue