Photoshop :: Photoshop Application Window Shrinks

Just recently, I started having issue with Photoshop when opening a file outside the application (i.e., not doing it by using the File>Open command in Photoshop).

I click the file to open it in Photoshop and the application window shrinks almost entirely. It shrinks to about a 1-inchx1-inch square in the upper-left corner of my screen. I expand the window, and the image file that I had opened is also about 1x1, making the image about a millimeter in size. Of course, I increase the image to its actual size.

My question is: why is my Photoshop application doing this? It's a recent glitch; it hasn't always done this. I have not done any significant changes to the computer other than regular Windows updates.