Thanks for the replies.
Looks like the problem was a pbcak error. Had my windows machine running in a minimal services configuration, probably why I couldn't get a directory listing while running my ftp client.
Still a little perplexed by the new directory though. Continuing to look into that.
I'm running Wordpress and recently installed exhibit Engine for my photos. I had a lot of trial and error getting exhibit Engine configured. Perhaps the new subdirectory is related to that, although the date/timestamp is a little strange.