Great plug-in, easy to use and works reasonably well

This plug-in is an excellent option for zooming in on images and I would have given 5 stars but have found an issue that I am unable to resolve. With the majority of the images the zoom function allows you to view all the image when moving the mouse over the thumbnail. See example 1

But in other images the zoom appears to be restricted and you only view parts of the image. See example 2

Note the box around the pointer are different sizes when you put the mouse pointer over the images. One is square and the other is rectangle.

If I can resolve this then the plug-in will deserve 5 stars.