After some light testing this seems like an awesome plugin (and I've been looking for a poll plugin that works with multisite for quite a while). :)
However, I'm having some problems with activating it. Use multisite, activate on individual site -> works fine. Use multisite, activate on the network view -> templates and all default configurations for poll options are missing. It does add the plugin functionality to admin view on each site, but for some reason template table (and probably also config table) for each site in database are empty.
Am I missing some config stuff here or is it really not working on network activation? Activating on each site separately is unfortunately not an option since we have over 1000 sites in our system.
I'm using the latest version of YOP poll (4.2).