Now this problem has happened before. It's always after going up a steep hill. Why is that? Do I need to take it into LBS or is it fixable? Basically I don't know how to explain it. When I pedal, I can't get into any gears. My bike cannot generate any power and I'm just spinning my wheels.

On a side note, my saddle bones aren't sore. I just rode 45 miles on my new ALR Emonda with my new padded bike shorts and I don't feel sore. I feel less sore after 45 miles now then I did after 25 miles. So I think that my saddle is good, maybe I just needed better shorts and a little getting used to the bike. But now I have the gear problem and it happened at the end of my workout.