Just bought TubePress Pro to use with Vimeo, and quickly hit a wall. Running WP 3.6 multisite on server running Nginx, if that matters.
I added both the consumer key and consumer secret on the Feed tab (which means a registered the app with Vimeo).
I put the default shortcode in a page.
I selected one of the defaults for Which Videos? - "Videos This Vimeo user likes" (keeping the default value)
WIth those settings, instead of seeing a pretty gallery, I see "Unable to unserialize PHP from Vimeo". If I switch to YouTube, TubePress displays as expected.
Suggestions to resolve? Is the callback URL on the Vimeo app setup required?
On a separate note, can I have both the free TubePress and TubePress Pro installed? In other words, can I rename the pro version to add "Pro" and use a folder name of /tubepress-pro ?