It may be time to start taking things apart and testing them individually.
It sounds like you have pressure to the regulator when you open the tank valve, so you are OK to that point. Now remove the solenoid, and using reasonable precautions, turn on the tank valve for a second and see if you hear hissing/smell gas. If not, bad regulator.
Wait for gas to clearn then turn on the solenoid controls and see if you can blow through it. If not, check the voltage at the coil--12V bad solenoid, 0V, bad wiring/controller.