You have a filter on. Hit F5 to toggle on the filter toolbar and then click on the arrow or the filter that is turned on to turn it off.
I figured it out. It was a Selection Filter.
when you are typing SW has some automatic hotkeys set to letters on the keyboard to turn the filter on and off. E is for filtering edges and everytime you hit the E it turns it on and the next turns off the filter....there are others check the help file the key. go to customize and click the keyboard tab a check the box that says show only ...look you'll see