Thanks so much. The electrician suggested that both circuits that run through my living room run through the junction box (where there is a splice), which is behind the living room light fixture in these old buildings. I smell the burning smell when I use both of those circuits but one circuit moreso. Yesterday, I got the burning smell going and smelled the light fixture and it did not smell stronger than anywhere else. I can't seem to isolate the smell to any particular area at all. It doesn't smell like plastic burning, just a burning smell. Also, since this pungent smell has been going on, no fuse has blown. This is such a mystery. Any advice would be much appreciated. Thanks.