I Fixed It?

The heat is on...
After about 18 hours of messing with the stupid furnace, I changed the filter (Jay's suggestion from work). Unbelievably, the stupid thing seems fine now. I guess our theory is that when the airflow was reduced it was tripping something that was shutting it down? Who knows if it's actually right, but it's been working fine ever since.
I'm appreciating the balmy 20 degree weather even more!