Airport 2005-001 update adversely affecting DHCP on PowerBook?

I have a PowerBook (Alum 1GHz) which after installing the above mentioned airport update has problem obtaining valid DHCP leases from my Airport Extreme or Airport Express base stations.
It works (or doesn't) something like this:
1) open laptop (wake from sleep)
2) airport connects, but network status says it can't obtain an IP.
3) turn airport off and on again (doesn't usually fix it)
4) open network sys pref and click "renew" over and over again until it gets a valid IP address.
It usually takes a while before it works. I can also, alternatively, just wait for 5 min or so and it'll fix itself. But waiting 5 minutes to get a network connection every time i open the laptop isn't really a good option.
Anyone else have this problem? Is there a fix? I think i'll downgrade my airport drivers in the meantime.
.tim
PowerBook G4 12" (6,2)   Mac OS X (10.4.4)  

FYI: rolling back to the kext files from before the update didn't seem to make the issue go away. Which is very strange since I didn't have the problem before the update.
But i've got no better ideas.

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