Well, it turns out my usb cables were ALL flaky. Got one that worked, all problems solved.
I vastly prefer Denis’ Tonelib to the Zoom app. Much easier to use. I am loving the B3n.
Well, I've just loaded v3 up, and it seems to work OK, apart from a nag screen telling me to connect to the internet. I added the v2 firmware with no problems.
The editor and general layout is not as intuitive as Tonelib.