Can’t select dates in Outlook 2002

Hello all,

I’m running Windows XP with SP2 and have a microsoft optical trackball 1.0

Suddenly I can’t “select” dates in Outlook 2002 using the calendar controls. For example, to set up a new task, I must type in the due date. If I click the down arrow to select a date from the little calendar control, the calendar does open–but the minute I try to mouse over it, the calendar control closes.

Thanks in advance for any help you can provide!