...

src/calibre/devices/misc.py

@@ -187,7 +187,7 @@ class LUMIREAD(USBMS):
             cfilepath = cfilepath.replace(os.sep+'books'+os.sep,
                     os.sep+'covers'+os.sep, 1)
             pdir = os.path.dirname(cfilepath)
-            if not os.exists(pdir):
+            if not os.path.exists(pdir):
                 os.makedirs(pdir)
             with open(cfilepath+'.jpg', 'wb') as f:
                 f.write(metadata.thumbnail[-1])

src/calibre/manual/faq.rst

@@ -468,6 +468,18 @@ If it still wont launch, start a command prompt (press the windows key and R; th
 
 Post any output you see in a help message on the `Forum <http://www.mobileread.com/forums/forumdisplay.php?f=166>`_.
 
+|app| freeze when I click on anything?
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+There are three possible things I know of, that can cause this:
+
+    * You recently connected an external monitor or TV to your computer. In this case, whenever |app| opens a new window like the edit metadata window or the conversion dialog, it appears on the second monitor where you dont notice it and so you think |app| has frozen. Disconnect your second monitor and restart calibre.
+
+    * You are using a Wacom branded mouse. There is an incompatibility between Wacom mice and the graphics toolkit |app| uses. Try using a non-Wacom mouse.
+
+    * You have invalid files in your fonts folder. If this is the case, start |app| in debug mode as desribed in the previous answer and you will get messages about invalid files in :file:`C:\\Windows\\fonts`. Delete these files and you will be fine.
+
+
 |app| is not starting on OS X?
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~