Note
Just if anyone is interested....
I noticed that while on most runs/rides, AP is automatically calculating the climb, on Tuesday's bike ride it didn't. So I sent a note to Ken inquiring if I was messing something up. And his answer --
"The service that I'm getting the corrected elevation data from has a daily point limit per user. Unfortunately it's pretty easy to run into the limit with a normal long session, and then the correction fails. In that case we also don't calculate the climb since it could be way off.
I either need to find a better data service for this or create my own, but in the meantime, there's nothing that you should be doing differently."