I have my own track interactive overlay that Chen did. I have received complaints of mouse sensitivity being very poor during the tracking process... like it used to be (pre 362). Recently I added the very cool "GIF Processing" code that you suggested for providing a progress indicator during the OverlayDrawing process. Well... I'm seeing that progress bar between each mouse click when tracking... which obviously makes tracking performance pretty poor.
I cannot find anything that I'm doing during the mouse move or mouse click or map click events that would be causing this refresh. Is this coming from the interactive track overlay?
When I go back to the office tonight, I'm going to put break points in all of my event handlers, to make sure I'm not doing anything to cause this. But, can you confirm that you are or are not doing anything while tracking that woudl cause this overlay drawing event to fire?