I have an ezb v4 that has been on the shelf for several years. (worked when last used). I was on the shelf too so we are both a little dusty so bare with me.
When I set up an I/O port in ez builder for a servo there is no signal present on the signal pins. I have a scope on them. If i go to the diagnostics page of the ezb's web server and hit the "center all servos" button the pins come to life. I think its something simple but ...?