Solaris 11 host no longer sees a ZyXEL wifi network router

This issue is on a Toshiba Tecra M10 running Oracle Solaris 11.1 SRU 0.5.11-0.175.1.0.0.24.2
The once functional wifi network iwh0 (net1) no longer sees a ZyXEL NBG-416N wifi network router.
The e1000g (net0) can connect to the router when direct connected via TP ethernet cable from the laptop wired ethernet port.
There are other wifi networks visible from iwh0 (net1) when the command 'dladm scan-wifi' is run.
When attempting to connect with the 'dladm connect-wifi' command (I know the command is good I recall it from the shell command history) .. I get "no wifi networks with the specified criteria are available"
The laptop is able to connect to one of the other wifi routers over this interface however not my own router (which appears to no longer be visible from Solaris 11.1).
I am able to connect to it from an HTC mobile phone and a Windows 7 laptop.
Removed wifi cache file /system/volatile/dladm/network-datalink-management:default.cache.0 and rebooted. No joy.
If I boot from the Solaris 11 DVD, I can still not see the expected wifi router.
At this point I am suspecting the ethernet address of the M10 iwh0 (net1) interface.
'dladm show-phys -m' lists the interface ethernet mac addresses (even if not plumbed).
Connected to the router (from alternative system, over wifi) and looked around. Noted the logs had a messages "possible DNS-rebind attack detected: a-0.19-*8d9zff4tq7njzcj.avts.mcafee.com" that seemed to start about the time I lost sight of the network? Can no longer say for sure as I restarted the router and it seems to have lost those log entries.
Contacted the ISP who provided the ADSL/router for use with their FTTC service offering - they are not aware of any 'protection mechanism' on the router that might mask a misbehaving mac-address.
Tried changing the mac-address on the iwh interface with 'dladm set-linkprop -p mac-address=06:05:04:03:02 net1' and ran 'dladm scan-wifi' without success (then reboot with 'init 5') resets to original but after reconfiguring again -still not available.
If anyone can help .. perhaps having seen something like this and solved it .. or even simply help with better troubleshooting, please advise.

Okay .. I changed the routers 'channel selection' from 13 to 7 and this wifi router network ESSID is again visible to the Solaris 11 instance. I expect the other OS's cater for this a little more elegantly?
~ # dladm show-linkprop net1 | grep -i channel
net1     channel             r-   7            --           --
~ #
It seems the channel property wont be visible unless there is a connection (I suppose obviously).
I expect another router has moved into the radius close enough to interfere?

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