Mouse coords when scaled in player

This just threw me for one and so it has me wondering. I have a screen saver, in an app, that monitors for a timeout like:

if (mouseX != lastMouseX || mouseY != lastMouseY) {

}

When viewed in Flash everything worked as expected. However, when viewed in the player, just by double-clicking the .swf, or through a projector .exe, the saver would never start… Took me a while to figure out that if I right-clicked and chose 100% it worked fine.

Something with the mouse coords when the movie is scaled, I assume, but it seems it should still work - scaled or not - no movement is no movement. Right?

Need to test more, but thought I’d ask here.