Yes, I'm using Cisco switches. My topology is router>(Trunk)>Switch>(Trunk2, untagged VLAN1, tagged VLAN2, etc.)>WAP.
As you know the Cisco requires a port with tagged and untagged traffic to be configured as a trunk port so that's how I've configured the ports connected to the WAPs.
I've upgraded the software on the 2nd access point but it's still asking me if I'm connected to Configure.me wirelessly. When I clicked next, the page timed out...
and when refreshed the page, it took me to the static IP of the master AP and now shows 2 access points connected! Great success!