diff -Nur calibre.orig/src/calibre/gui2/update.py calibre/src/calibre/gui2/update.py
--- calibre.orig/src/calibre/gui2/update.py	2010-06-21 19:38:04.000000000 -0600
+++ calibre/src/calibre/gui2/update.py	2010-06-21 20:30:50.000000000 -0600
@@ -39,12 +39,12 @@
 
 class UpdateMixin(object):
 
-    def __init__(self, opts):
-        if not opts.no_update_check:
-            self.update_checker = CheckForUpdates(self)
-            self.update_checker.update_found.connect(self.update_found,
-                    type=Qt.QueuedConnection)
-            self.update_checker.start()
+    #def __init__(self, opts):
+        #if not opts.no_update_check:
+        #    self.update_checker = CheckForUpdates(self)
+        #    self.update_checker.update_found.connect(self.update_found,
+        #            type=Qt.QueuedConnection)
+        #    self.update_checker.start()
 
     def update_found(self, version):
         os = 'windows' if iswindows else 'osx' if isosx else 'linux'