Same problem with Omega2 - can not connect to Wifi router (ASUS RT-AC66U). Omega 1 connected perfectly under exactly the same conditions. Spent hours trying different solutions described on forum - no luck.
Seems like I have to put my 4 Omegas in the box for some time and go back using ESP8266 based boards - may be Omega team will solve it some day. Guys, when basic/core functionality of the device is so buggy and unreliable - this is crap, I'm sorry to say that even if it disappoints all those people excited about KickStarter concept, "visionaries", "innovators", who is working hard, etc., etc.
All the configs are pretty much default
output from aps:
ASUS_24G 74:d0:2b:3f:ce:f8 WPA2PSK/AES 63 11b/g/n
uci show wireless
wireless.ra0=wifi-device
wireless.ra0.type='ralink'
wireless.ra0.mode='9'
wireless.ra0.channel='auto'
wireless.ra0.txpower='100'
wireless.ra0.ht='20'
wireless.ra0.country='US'
wireless.ra0.disabled='0'
wireless.@wifi-iface[0]=wifi-iface
wireless.@wifi-iface[0].device='ra0'
wireless.@wifi-iface[0].network='wlan'
wireless.@wifi-iface[0].mode='ap'
wireless.@wifi-iface[0].encryption='psk2'
wireless.@wifi-iface[0].key='12345678'
wireless.@wifi-iface[0].ApCliAuthMode='WPA2PSK'
wireless.@wifi-iface[0].ApCliEncrypType='AES'
wireless.@wifi-iface[0].ssid='Omega-379D'
wireless.@wifi-iface[0].ApCliSsid='ASUS_24G'
wireless.@wifi-iface[0].ApCliPassWord='weauhpn,lkyxbr''
wireless.@wifi-iface[0].ApCliEnable='0'
wireless.@wifi-config[0]=wifi-config
wireless.@wifi-config[0].ssid='ASUS_24G'
wireless.@wifi-config[0].encryption='WPA2PSK'
wireless.@wifi-config[0].key='weauhpn,lkyxbr'
root@Omega-379D:/# uci show network
network.loopback=interface
network.loopback.ifname='lo'
network.loopback.proto='static'
network.loopback.ipaddr='127.0.0.1'
network.loopback.netmask='255.0.0.0'
network.globals=globals
network.globals.ula_prefix='fd1d:48c4:7633::/48'
network.wlan=interface
network.wlan.type='bridge'
network.wlan.ifname='eth0.1'
network.wlan.proto='static'
network.wlan.ipaddr='192.168.3.1'
network.wlan.netmask='255.255.255.0'
network.wlan.ip6assign='60'
network.wan=interface
network.wan.ifname='eth0'
network.wan.proto='dhcp'
network.wwan=interface
network.wwan.ifname='apcli0'
network.wwan.proto='dhcp'