@Tom-Elliott Thank you. I removed / reinstalled vsftpd, and tested ftp as per https://wiki.fogproject.org/wiki/index.php?title=Troubleshoot_FTP#Credentials_.2F_Passwords - deleted the image, the image dir, the host, and set all of it back up again. The new capture was successful.
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RE: captured images uploading to /images/dev/<mac addy>