...

src/calibre/devices/usbms/driver.py

@@ -413,8 +413,14 @@ class USBMS(CLI, Device):
             return '(.+?)'
         s = set()
         f = functools.partial(replfunc, seen=s)
+        template = None
+        try:
             template = cls.save_template().rpartition('/')[2]
             return re.compile(re.sub('{([^}]*)}', f, template) + '([_\d]*$)')
+        except:
+            prints(u'Failed to parse template: %r'%template)
+            template = u'{title} - {authors}'
+            return re.compile(re.sub('{([^}]*)}', f, template) + '([_\d]*$)')
 
     @classmethod
     def path_to_unicode(cls, path):

src/calibre/ebooks/mobi/debug/mobi8.py

@@ -63,7 +63,6 @@ class MOBIFile(object):
 
         self.raw_text = b''.join(r.raw for r in self.text_records)
         self.header = self.mf.mobi8_header
-        self.kf8_records = mf.records[offset:]
         self.extract_resources()
         self.read_fdst()