Can you post a simple example that shows what you are seeing? When you change the value of the control and then click on some other control you should get the event. I wonder if there is an issue with your code that explains why it is not firing.
I have attached a simple vi (LV8.2) to test numeric events. When I change the numeric and then I click anywhere outside the box, even if I click the boolean button, the numeric value change event is executed. Check to see if you have any Key Navigation assignments for the Numeric control. This may be your problem. Also, look at Tools - Options - Environment to see if you have the "End test entry with Enter key" checkbox checked. I have it unchecked. Having it checked may force you to press the Enter key to fire off the value change event.