Did you have the tank filled with Propane or Liquefied Petroleum Gas (LPG)? LPG has more energy, but it also vaporizes at a higher temperature. Since you're in Alberta I would guess the temps are near or below the freezing point. Depending on the gas mix in the LPG it might not be vaporizing properly and plugging up the regulator.
The typical LPG mixture is 50% Propane and 50% Butane. Depending on the grade it may not fully vaporize in temperatures below +44*F. Commercial Propane has to be 90% propane by standards. It can contain up to 10% butane or other combustible petroleum gasses. If memory serves correctly it vaporizes down to about -40*F.