Q: Scanner Utility Disappeared

So, I just spent all afternoon on the phone with HP tech support, because my device was not scanning.  It would go back and forth between my computer not recognizing the scanner, and my scanner not recognizing the computer.  We reinstalled the latest HP printer software, and also the appropriate drivers from the Apple website, and that seemed to do the trick.

I have a macbook pro with Mavericks, and an HP 4635 all-in-one printer.

I succesfully got the scanner to work after the call, and was using the scan utility succesfully for the past hour or so, by clicking the "Scan" tab in the utility for the printer, then clicking "open scanner".  It opens a window where you can name the file, adjust it's color, file type, etc.. and just click scan.

Suddenly (and through absolutely no change on my part, I simply put a new page onto the glass) the utility grayed out, and the "open scanner" window just turned into a blank grey window.

I've restarted the printer and the computer, but now, every time I "open scanner", it brings up a totally empty window. 

Any thoughts?  This has been ridiculously annoying, as I have been trying to scan all day, and have nothing but issues like this in the 4+ months I've owned this printer.