Seems to be this but can't be sure as it could just be a plugin
2013-06-17T22:08:34.600Z [7FFFDA994710 error 'Default' opID=aebeb7d5] (Log recursion level 2) vim.fault.InvalidLogin
------ In-memory logs end --------
can you check and upload the rest of the vpxd*.log files as well?