I've had the same issue- electric shut off valve works with no lp pressure in line- unfortunately the only repair that has worked for me is replacing the entire regulator assy w/the new shut off valve installed as part of the package.

I've replaced the shut off valve but kept the seemingly good regulator to end up with the same symptoms. I then rebuilt the regulator but still no better. I can't tell you why ( I wish I knew) but replacing the entire regulator was the only repair that worked.