Did they over fill the tank and you are getting pure liquid to the heater..... Sounds like when you use a propane bottle hand torch and tip it up side down the flame turns orange and goes out. Also the regulator vent may have gotten plugged with dirt or ice. May try and bleed some of the propane pressure off of the top of the tank....... But make sure you have it outside and plenty of ventaltion and no open flame any where...... Propane is lighter than air so it settles down on the ground at the lowest point.....hope this helps..... Or you could take it back to your suppler and get a different tank.