Here's some advice for you as you try to figure out you scanner, and the systems you will be putting into it. You should do some research on the RR Wiki to help you understand things like how a Trunked radio system works, or what a talkgroup is and how it relates. This should better help you understand what you have and how to work it. In addition, you should also look over
Radio Shack Scanners - The RadioReference.com Forums, because you might find previous threads that have similar problems you are having. Radio shack's manual mostly goes over how the scanner features work, but not how the systems you put in it actually work. I will say the PRO 106 is a very advanced scanner, and one of the few that can listen to digital communications. Because of this, it can confuse many, especially to beginners. I should know, my first scanner was an advanced one, and I had so much confusion.
Otherwise, here is my next question. "What Program are you using to download Washington county to you scanner?" I may have a hunch of what is going on, but I want to make sure