Last week I switched out the regular glass on my liberty for the etched elk glass and know on the handle side of the door I'm seeing black horizontal streaks. Is this from possible air leaking? My gut feeling tells me it is but I wanted to make sure. The new glass didn't come with new gasket but the instructions said to use the existing gasket so I did because it looked almost brand new. I tightened the glass clips very tight but maybe could have gone a little tighter but I really didn't want to break the $179 glass. When the stove goes cold tomorrow I'll take the door apart and tighten some more.