I just upgraded from 7.4 to 7.5 with PowerAgent, and I am having the same problem.
Did you ever figure out a solution?
Did anyone else figure it out?
I have searched all over, but this is the only page that even mentions this issue.
My Garmin 705 was working perfectly with my PowerAgent 7.4. But once I upgraded to 7.5, it says something about a variable rate and that it can't calculate peak power and some other things (that I forgot to write down). Something about IR maybe?
What I don't understand is why it was working fine with 7.4, and then it stopped working with 7.5.
The worst part is that it took away all my old peak power data that had been there before, so it's just blank now.
I hope that they'll do a software update to at least make the software work as well as it did with 7.4. It's disappointing to lose data like that. I wish I hadn't upgraded.
7.4 didn't care, 7.5 calculates things like NP and stuff where it "needs" (it doesn't need, but it would be less accurate) regular recording intervals.