Our old friend strikes again…
This topic has been written about so much on the net I find it crazy that I’m still finding out little tips and tricks about getting it to work. In any event, I had trouble setting it up this morning and found that after configuring the farm account settings you need to restart the SharePoint 2010 Timer service and complete an IISRESET or simply reboot the server.
Here is the link to the forum post where I found all the goodness:
//Updated
After completed all the goodness above, be sure to rock an IISRESET. Here is a link to the referenced article:
http://praveenbattula.blogspot.com/2010/05/userprofileserviceuserstatisticswebpart.html