If I drag and drop images on the left side of the APG Main Window I get a Progress Bar Window that tells me that something is happening, so I know that images are loading, even though the Progress Bar Window, most of the time is behind the APG Main Window.

But if I first open a New Group Box and then drag and drop images there I get nothing but a Spinning Beach Ball... nothing is actually telling me that images are loading, even though they are!