Thanks to all the help on this board, my orlan 60 is working great. not too hot...not too cold. Been splitting all of my wood and its been doing well. My question now, though, is after an extended burn...like from bed time til morning...my damper door gets stuck closed. Actually my wife just got home and texted me and said she's tried everything to get the damper open so she can open the upper chamber and get a fire going again...and she can't get it open. What causes that? Creosote? Air vacuum? Beats me. Any suggestions on why this is happening now that the stove has been working so well??