I still haven't been able to reproduce the problem here. I finally found where the error message is coming from (do you know how many times the word "Error" appears in the GT source code???), so that's a first step.
As a first guess, try turning off the Axe-Fx and see if the transfers work. I wonder if there's some interference going on between the Axe-Fx and settings transfer. It's not happening here, but it's still my best guess.