Outlook 2007 Outlook Today - Personal Folders goes blank

[Usnatsmm]

I have Outlook 2007 SP1 installed on XP Media Center SP3.
Outlook is setup to display Personal Folders - Outlook Today on startup.
I used the 'Customize Outlook Today' button to set it up with 'Personal
Folders for Messages, '7' Days for Calendar, 'All tasks' for Tasks and
'Standard' for Style.
When I start Outlook, the Calender, Tasks and Messages columns flash a valid
display, then go blank.
How can I get Outlook Today working again? It is a very helpful
Day-at-a-Glance tool.