The plugin uses wp_title(), specifying only the first argument. In WP core, it specifies 3 arguments. Plugins such as BuddyPress that filter wp_title expect 3 arguments, because that's how it is used in core. We occasionally see people reporting this problem on the BuddyPress.org forums, and most times it is caused by Polldaddy.
Patch on pastebin http://pastebin.com/nsmwSxZ4, and just adds empty strings for the missing two arguments, so it won't cause any regressions in the Polldaddy plugin.