OSX 10.5.7 seems to mess up DHCP on my Linksys WRT54G2

Our config: home, wired and wireless LAN. 2 PC's with Win on Wired Lan. 2 MBPs (one new and one old) working on both wired and wireless. And some other less used machines like an old Mac. O, and Xbox, Xbox360. Router Linksys WRT54G2.
All of this has been working for months. Router is setup to provide LAN-devices IP via DHCP.
I also use my new MBP while commuting: it then uses wireless internet.
Since i upgraded to 10.5.7 it seems that whenever i connect my MBP to the LAN, the router doesn't issue an IP-address to my Mac (my Mac self assigns an 169.xxx-address. Worse: all other machines on the LAN loose their IP-address! I need to reboot the Linksys a couple of times, and then it works again ... I think there even was a time the problem occured some time later, while i was still working & connected.
Is it really me/my MBP? Well, it looks like it, since as long as i'm not home, the family is happily connecting their machines to the internet without problems.
First i thought it might be the router, so i upgraded to the latest Linksys. Did not help. I have searched the internet for a couple of weeks now. I have tried creating a new location on my Mac: did not help. I have tried switching from DHCP to DHCP+Manual IP and back (read that somewhere): did not help.
I wish i could role back the update, and see whether that would solve the problem, so i know for sure it is this 10.5.7 update that is causing the problem. But after trying all kinds of things for a couple of weeks now, it really looks to be the 10.5.7 upgrade.
Anybody with ideas? If i need to provide more info, please let me know what i left out. And please don't assume i haven't tried the obvious, even if i forgot to mention it here. But if in doubt, ask me, and i'll let you know .

@Nerowolfe. 1st of all: thank you for your reply & time!
The WRT54G2 is a brand new Linksys. I know Linksys for being a good brand, and assume the fact it concerns a new model, should mean basic stuff like DHCP should not be a problem. On the other hand i know everything is possible with computers . That said: i did an upgrade to the newest router firmware on purpose: i did not in the 1st place look for the problem with 10.5.7. But after having tried to rule out everything else, and having noticed the problem started (as i recall) the moment i had upgraded, i think 10.5.7 plays a role.
I thought to post my experience and idea here, to see whether other people have similar problems. That might eventually lead to a solution.
I will (did not yet do that) also post my problem at the Linksys-forum, as i agree, it might be the combination.
But it does look like something changed in the network parts of 10.5.7 compared to its predecessor. And i would hope some engineer would know what that change is and be able to explain what the problem might be?
I know changing anything is a risk. But also that upgrades most of the time need to be applied for security reasons? You say: make a backup. What is the easiest way to do that? I normally backup my data, but not the whole system. I would hope it would be possible to role back any update; that would be good engineering?
Anyway: the problem still exists, and any help is welcomed! If my post at Linksys leads to a resolution, i will post it here.

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w3.org/2001/XMLSchem
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---8<---
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http://oraclequirks.blogspot.com
http://www.yocoya.com

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Apple doesn’t routinely monitor the discussions. These are mostly user to user discussions.
Send Apple feedback. They won't answer, but at least will know there is a problem. If enough people send feedback, it may get the problem solved sooner.
Feedback
Or you can use your Apple ID to register with this site and go the Apple BugReporter. Supposedly you will get an answer if you submit feedback.
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