802.11n on a D-Link Router

Hi,
I have a 2.2 GHz Macbook Pro running 10.5.2 that I connect to my Comcast cable modem through a D-Link DIR-625 router. I've used this successfully since Sept. 07 but have now discovered I cannot connect wirelessly using mixed 802.11n, 11g, and 11b. I can connect fine through the router using an ethernet cable. And I can connect wirelessly if I restrict the router to 802.11g and 802.11b.
I've spent hours on the phone with the D-Link support group and they've even replaced my router with another one. The new router is the same model and works the same way.
I'm wondering two things:
1. Has there been a recent software update from Apple that might change or affect the 802.11n draft functionality? (I have always installed all the latest software updates).
2. Has anyone else seen a recent change in how their Mac connects to third party 802.11n routers?
Thanks for your help.
Jim

I have the same MacBook as you, but still at OS 10.5.1 and a DIR-655 router. I don't have any experience with a prior OS for this router.
Does your Laptop connect when you broadcast only in n mode? Do you need to use the mixed mode?
My MacBook connects OK when the router broadcasts in 3 modes b/g/n, BUT THEN my older Tibook (wireless b) does not connect anymore, although it sees the router broadcasting. When I set the router to b/g only, then fine both laptops connect. So now, to be able to use wireless n I have the D-Link working in n mode only for the MacBook, and my Linksys router hooked up to the D-Link via ethernet and broadcasting in b/g mode for my TiBook. It's not how I expected it to work but until I get a sensible answer from D-Link… I read somewhere of someone having the exact same issue. D-Link's advice was to use b/g. It seems that it's not as "backward compatible" as announced.
manu

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