Hi Jon,

>There are WAIT commands in the form, but they're all cleared.

If there's a WAIT command, the mouse down will clear it, too. This can make it impossible to see a wait window, at all. All you notice is that the MouseDown event is ignored.

> Another thing to point out is that the necessary double-click to activate the other page only happens one time.

This sounds like there's some code that only runs the first time and either moves the focus or catches the mouse events. Have you tried SET COVERAGE to find out which lines are executed when you need to double click vs. when a single click is sufficient?