My Tasks - "Looking for your tasks for the first time..."

I created a new SharePoint 2013 farm and set up user profile service and crawled our Active Directory. What I have found is that for all the users in this environment, their My Tasks work...e.g. if I have a task assigned to me in a site collection it'll show up in their "My Task" page. For one user...and it happens to be me...I get "Looking for your tasks for the first time..." (with a whirling icon) and nothing shows up.

Any suggestions on why this might not work?

SharePoint Solution Architect, Perth Australia - Microsoft Virtual Technology Specialist - MCTS WSS Dev, WSS Adm, MOSS Dev, MOSS Adm -http://wss.made4the.net/ - Founder of http://www.sharepointdevwiki.com/