MBP APE can not connect to 802.11n only 5GHz

I purchased a 17" MBP about a month ago and then got the APE two weeks ago.
I am running DSL to a Linksys (not WiFi) router. I attached the APE to the Linksys and created a network using 'Bridge'. Everything worked great. During setup I tested 802.11n (b/g compatible) and 802.11n only 5GHz, but left it at b/g compatible. Airport Utility is on my G5 dual 1.8 which is hard wired to my Linksys.
A week ago I lost the connection from my MBP to the APE. I unplugged the APE for a minute and then plugged it back in. I got my connection back. This has happened only once.
A few days ago I applied the APE update to my MBP and everything seemed okay.
Today I tried switching from b/g compatible to n only (5 GHz). When I choose n only from Airport Utility my MBP can no longer see my APE network (this did work before).
I did a restart, Repaired Permissions and I also unplugged the APE. No joy.
Everything is fine with b/g compatible but n only does not work.
Any ideas?
Thanks,
--ken

Yes, I did run the n enabler when I first set up my MBP and I was able to connect as n only for several weeks. Then two things happened, I lost connectivity which unplugging the APE fixed and a few days later I ran the APE for Intel update.
Thanks,
--ken

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