Bread-Bakers v108.n017.1

At my former house, which was at sea level, I got tremendous 
ovenspring with my breads.

In our new house, which is at 3300 feet, I get no ovenspring whatever.

My range is different also, though both are electric.

I'm hoping someone can help me understand why this change 
occurred.  Is it likely to be the oven?  Or is it the 
altitude?  Something else?

Linda