I have seen teams having problems with the CAN Device ID of the PCM being incorrect, causing the default for Solenoid Open.vi not to match the PCM's actual device ID. To fix this, go to
http://roborio-7019-frc.local/ in a browser while connected to the robot, and that should take you to the web interface if Silverlight behaves. This only works in some browsers, but Chrome is the only one I know of that insists on connecting to the Internet before opening a URL, typically.
Once you're in the web interface, things are easy to learn and pretty explanatory.