I'm running a RB2011 with 3 UAP-AC's and a UAP-AC-Outdoor without problems too. One is connected to the RB2011, the others through some 'dumb' Gigabit switches.
But if you say you have not touched the RB2011 configuration, your issue may be there. I have no clue what it does by default... I just erase the config.
How exactly have you cabled the RB2011?
Port1: WAN incomming
Port2: To Switch (NAT'ted, DHCP provider, DNS provider)
Your picture would suggest this. And that would seem correct, or at least, that is how I would connect it. Personally I have never used quickset before since I like to know what is going on, and it pays to take the time to learn how it all works. Still, I can understand you wanting to have your problem fixed quickly.
What you could try is creating a bridge of ports 2 and 3,4,5 and connecting the AP's directly to those ports. Normally you would not bridge those ports together but switch them in the RB2011, but that's another step to explain. Make sure port 1 is not part of your bridge! What you need to do after creating the bridge is tell the routerboard your LAN IP needs to be on that bridge and the DHCP server also needs to be changed to the bridge.
Now try to use the UAP's directly on the RB2011 and see if it works. If it does, the problem is centered somewhere around your uplink. If not, it's probably something in the routerboard config.
No worries though, this can work, 100%. Very neat case you have there!
![Shocked :shock:](./images/smilies/icon_eek.gif)