Wireless network weirdness, since 10.5.6 update

Hi Guys,
Can someone please help, I have a Belkin N1 Vision wireless router and everything WAS running fine on it.
But since I updated my MacMini system to 10.5.6 it doesn't appear correctly in the DHCP Client List on the router. The IP Address appears fine (192.168.2.2), but the other info doesn't (Host Name= Unknown, Mac Address= 00:00:00:00:00:00).
I have checked the Network Pref Pane & Network Utility and all the correct info appears, just not on the router (sometimes it just doesn't appear in the list, but internet works fine).
I should point out the all other devices on the network (Laptop PC, Xbox360, HP wireless printer), anyone have ideas what the problem may be?

Thanks for your reply.
The routers firmware is all up-to-date, it all displayed in the client list fine until I applied the 10.5.6 update (via SU).

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What am I missing here. I'm sure it is some kind of sitting that is not right.
Thanks Pat

Sounds familiar:
lllaassJan 6, 2015 2:12 PM Re: My husband has a Mac mini, vintage 2009, running Snow Leopard. All other computers and devices in the house are able to connect to our wireless network, but since I upgraded his computer to Snow Leaopard it won't connect. What is the problem?
Re: My husband has a Mac mini, vintage 2009, running Snow Leopard. All other computers and devices in the house are able to connect to our wireless network, but since I upgraded his computer to Snow Leaopard it won't connect. What is the problem?in response to Patricia Isaac1
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Csound1 wrote:
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Wireless network weirdness, since 10.5.6 update

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