Mac Pro won't connect to "n" network.

I realised my new iPhone would be slowing my potentially 802.11n-speed wi-fi network so disconnected it. To make sure my MacBook Pro and MacPro were connected at 'n' speed, I opened AirPort Utility and set my 500GB Time Capsule to "802.11n only (5GHz)". To my dismay, the Mac Pro no longer saw the network, while the MacBook Pro connected fine. I reset the Time Capsule to "802.11n (802.11b/g compatible)" and the Mac Pro again saw the network and connected. Given that this page: http://www.apple.com/wifi/80211/ says that 802.11n delivers "greater performance, more range, and improved reliability", I can't make any sense of the Mac Pro's behaviour.
System profiler reports the Mac Pro's Wireless Card Type as "AirPort Extreme (0x14e4, 0x88)".
Does anyone have any idea what's going on here?
Thanks in advance,
Steve = : ^ )

I just moved my Time Capsule and tried this all again and it reminded me that I'd forgotten something: after changing the Time Capsule to "802.11n only (5GHz)", the Mac Pro does see the network, but when I select it, it asks me for the network password - this is stored in the keychain and the Mac Pro usually connects without asking - and, when I enter the password and okay the dialogue, it sits for a few seconds and then reports that the connection request timed out. *From then on* it no longer sees the network at all as described in my first post. This sequence of events has happened twice now.
Steve = : ^ )

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