I never use the zoom edit tool, but now it is turned on and will not allow me to crop video, it does allow me to zoom in the crop window. I have been unable to discover any way to turn this off so i can crop. I have searched web without success for a solution. Am using Vegas Pro 12
If I understand you correctly = you want to crop your source image select stretch to fill in the pan and crop window = NO.
So for example you have a talking head and you don’t want to resize the head as it was shot for your clip then you can simply move the cropped head position in the track motion without resizing. In my opinion this is a better way than cutting a mask or resizing the mask in track motion and have all that resampling going on.