I upgraded both IoX and PG3x at the same time as well.
Upgrades went fine, but I did experience a problem with the AC as well as UD Mobile app.
While I could log in to AC, the status icon at the bottom left would immediately go red. Also, UD Mobile, while seemingly connected was actually rapidly retrying connections as seen on the main top level home screen. I was drawn to that screen attempting to figure out what the little icon next to the House/Home icon was trying to tell me.
Turns out, at least for me, this update requires another outbound port, TCP:8003 for something related to the ISY Portal communications. Once that was configured, everything started to behave normally.