The TopMembersWidget uses the StatusLevelManager class to get the top 5 members in the given community. If I remember correctly, our status level manager is loaded asynchronously (for performance reasons) so the first time (after a server restart) you view a status level / leaders type widget, it may not contain the leaders. Is that possible? Are status levels enabled in the admin console (People --> Settings --> Status Level Settings)?
That is probably it...we bounce the server for various reasons quite
often. Status Levels are enabled; however, point values are 0 for all
actions. Will take a look....and let you know.
For us, the top members widget appears to display the correct "Top members" but the icon displayed that would be linked to their score / ranking is broken and only displays the icon as if the were a new user.