I don't have ICS enabled. Here's the config file after doing a factory reset, running the commands jdoe suggested, updating, then configuring wifi via wifi manager.
config wifi-device 'radio0'
option type 'mac80211'
option channel '11'
option hwmode '11ng'
option macaddr '00:13:37:**:**:**'
option htmode 'HT20'
list ht_capab 'SHORT-GI-20'
list ht_capab 'SHORT-GI-40'
list ht_capab 'RX-STBC1'
list ht_capab 'DSSS_CCK-40'
option disabled '0'
config wifi-iface
option device 'radio0'
option network 'lan'
option mode 'ap'
option ssid 'Guest Network'
option hidden '0'
config wifi-device 'radio1'
option type 'mac80211'
option hwmode '11g'
option macaddr '00:13:37:**:**:**'
option channel '6'
option disabled '0'
config wifi-iface
option device 'radio1'
option network 'lan'
option ssid 'Test'
option mode 'sta'
option hidden '0'
option encryption 'psk2+tkip+aes'