This is a weird one.
With the latest UpdraftPlus, and Dropbox...WP ver 3.7.1, Thesis theme ver 1.8.5. Hosting account on BlueHost. This is an add-on domain, not a subdomain, though.
I've setup UD as a plugin, and authenticated to DBox, it says it's authenticated, and I see correct user name and quota at my Dropbox in the upper bar of the plugin.
The backup runs (gives me a warning about Big Files, but OK...), and gets a success alert at the end.
But trying this with two different DropBox accounts, the backup set never gets to Dropbox!
I had tried it after disabling all plugins (but didn't set Theme to any of the defaults).
I've installed it on three other domains last night (all settings the same, even same host, but different Dropbox accounts. I even had it running on my Dropbox, until I got the account owner's dropbox login and changed from mine to their dropbox).
This one on ricksbees.com hasn't worked yet.
(Files are placed in the updraft folder inside public_html/subaccount dir , just not out to Dropbox).
Here's the latest log on pastebin, http://pastebin.com/pHmsnAbc
Thanks so much for any ideas!!
(have spent several hours on this)