Ape Apps

I've just installed the PDF Document Scanner App on my PC. I have 2 wireless printers. Unfortunately the program is only picking up one of them and it's the one that I rarely use. What's weird is that I installed it on my other laptop and it easily saw both of them. On the laptop I'm having difficulty with, I know that it's not a connection issue because after installing the PDF app, I wirelessly printed a document just to check the connection.

Any ideas on how to fix this? I love this app. It makes scanning so easy....once it's connected! :-)