Hi, just joined forum and recent Mach3 user and learning every day.

Anyone know why when I click the Plug in Control menu then select Video Window it causes Mach3 to lock up solidly, so much so that Windows XP w/SP3 cannot completely shutdown?
I'm not sure what the "Video Window" is unless it is referring to the Table Display in the upper right corner of the screen.  I find very little information about this menu item.

Any insights would be appreciated.

Video window is for use if you have a webcam connected so that you can use it for centring purposes. Probably really only of use if not needing great accuracy. Why your computer freezes I am not sure, it shouldnt do that even if you dont have a wencam connected.
Hood

Aaah, thanks for the insight.  Maybe it freezes because I do have a Logitech webcam  driver installed but the camera is not currently plugged in to the USB port.  Think I will try connecting the camera and see what happens then post the results, although I seriously doubt I would ever want to use it for the reasons you stated.

Thanks!