Hi Bruce,
Try disabling the Timer then set the interval to 0 and then set it back to whatever interval you want before enabling it again.

From this page on MSDN:
The Timer control's Enabled property determines whether the control responds to the passage of time. Set Enabled to False to turn a Timer control off, and to True to turn it on. When a Timer control is enabled, its countdown always starts from the value of its Interval property setting
So if you first set the interval to 0 and then reset it to whatever it should do what you want, right?

/Henrik.