I just looked through the manual online (
http://www.belkin.com/support/articl...8231-4_man.pdf ) and found something worth trying.
Have a look at Page 41 of the manual (use the page numbers on the page, not the Go to Page option in Acrobat). Try switching the bandwidth to 20MHz (which should have the same effect as disabling the N network).
I think it defaults to "Auto"