Had this just happen....I disconnected the regulator hose and switched the valve to the other tank.....reconnected and switched the valve back and then slowly opened the tank valve and the propane flowed ....only happened once and not sure exactly what caused it.....
From Central Texas
2014 Cedar Creek Silverback 29IK
2010 Dodge Laramie 3500 Dually
My Steelpony....2007 HD Ultra Classic...done up in a memorial to the 343 firefighters who died 9/11
Never Ever Forget....yes I was a Volunteer FF for 20 years........