I recently picked up another notebook and the ath card in it cannot see my SSIDs (meth, meth2.4 and open) at home. However, my two other notebooks, one using iwi and other other running Windows, can see these just fine (and all three notebooks are next to each other). The following is an ifconfig scan from both 4.8-stable machines, but the issue is also reproducible with a snapshot--any ideas appreciated.
iwi0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500 lladdr 00:13:ce:c7:e4:f6 priority: 4 groups: wlan egress media: IEEE802.11 autoselect status: no network ieee80211: nwid meth2.4 wpapsk [redacted] wpaprotos wpa1,wpa2 wpaakms psk wpaciphers tkip,ccmp wpagroupcipher tkip 100dBm nwid wings chan 11 bssid 00:1e:2a:05:26:8c 51dB 54M privacy,short_preamble,short_slottime nwid patrice chan 11 bssid 00:1e:e5:78:48:78 36dB 54M privacy,short_slottime nwid Juventus12 chan 1 bssid 40:4a:03:dd:a5:55 43dB 54M privacy,short_preamble,short_slottime nwid JadeMoose chan 6 bssid 68:7f:74:9d:64:29 58dB 54M privacy,short_slottime nwid JadeMoose-guest chan 6 bssid 68:7f:74:9d:64:2a 59dB 54M short_slottime nwid meth chan 10 bssid ac:a0:16:85:f7:00 70dB 54M privacy,spectrum_mgmt nwid meth2.4 chan 9 bssid ac:a0:16:ba:fc:b0 71dB 54M privacy,short_preamble nwid open chan 9 bssid ac:a0:16:ba:fc:b1 73dB 54M short_preamble nwid Wireless chan 6 bssid e0:91:f5:b3:62:64 61dB 54M privacy,short_preamble,short_slottime ath0: flags=8822<BROADCAST,NOTRAILERS,SIMPLEX,MULTICAST> mtu 1500 lladdr 00:05:4e:51:1d:a4 priority: 4 groups: wlan media: IEEE802.11 autoselect status: no network ieee80211: nwid "" nwid "" chan 11 bssid 00:00:00:00:00:00 0% 54M short_slottime nwid wings chan 11 bssid 00:1e:2a:05:26:8c 0% 54M privacy,short_preamble,short_slottime nwid patrice chan 11 bssid 00:1e:e5:78:48:78 0% 54M privacy,short_slottime nwid qwest9941 chan 1 bssid 00:24:37:10:3f:f0 0% 54M privacy,short_slottime nwid Lockton-Private chan 11 bssid 00:24:6c:11:f3:f0 0% 54M privacy,short_preamble,short_slottime nwid Lockton-Guest chan 11 bssid 00:24:6c:11:f3:f1 0% 54M short_preamble,short_slottime nwid Sevjan chan 4 bssid 00:24:b2:e0:64:e1 0% 54M privacy,short_preamble,short_slottime nwid Juventus12 chan 1 bssid 40:4a:03:dd:a5:55 0% 54M privacy,short_preamble,short_slottime nwid JadeMoose chan 6 bssid 68:7f:74:9d:64:29 0% 54M privacy,short_slottime nwid JadeMoose-guest chan 6 bssid 68:7f:74:9d:64:2a 0% 54M short_slottime nwid SharonRoth chan 2 bssid a0:21:b7:a1:20:ba 0% 54M privacy,short_preamble nwid Wireless chan 6 bssid e0:91:f5:b3:62:64 0% 54M privacy,short_preamble,short_slottime