Another shot in the dark, let's hope this fixes the random 503 error that I just got and that resulted in a generic Exception:

Exception((503, u'<HTML><HEAD>\n<TITLE>Service Unavailable</TITLE>\n</HEAD><BODY>\n<H1>Service Unavailable - Zero size object</H1>\nThe server is temporarily unable to service your request. Please try again\nlater.<P>\nReference&#32;&#35;15&#46;4125eb3f&#46;1364576786&#46;694e24a\n</BODY></HTML>\n'),)