In testing this morning I was able to reproduce the issue on firmware 2.1.7 on a v2.0 device. I don’t think it’s tied to the hardware or firmware at all but rather a fault of the iOS app specifically (as we suspected). However, after installing another version the app started working. I even deleted everything and re-downloaded from the app store and it works now.
I asked Ray to also test with his iPhone and it works for him and his colleague as well.
I am sure you tried this but if you force kill the app and restart it, does that have any bearing on the outcome?
I am still trying to pin this down and just looking for information, thanks!