After 10.6.8 upgrade, MacBook PRO doesn't acquire IP address via 802.11n wireless connection

After upgrading a MacBook Pro to 10.6.8, the machine connects to an 802.11n wireless access point, but will not acquire an IP address using DHCP.  An iMac running 10.6.7, and an iPad2 both successfully connect and acquire DHCP IP addresses to the same access point.  The access point is an HP Procurve MSM422 access point, a commercial data center level access point.
The MacBook Pro did acquire a connection and IP address when running 10.6.7, so this seems to be a regression introduced with the upgrade to 10.6.8.
The MacBook Pro running 10.6.8 will acquire an 802.11g connection to the same access point without any problems.  The access point has different SSIDs for 802.11n and 802.11g.
Changing the IP settings on the MacBook Pro from DHCP to a fixed IP address doesn't solve the problem.
Just wanted to document this situation for those following problems with migration to 10.6.8.
If anyone uncovers the reason and has a work around for this situation, please share.  I'll keep looking, too.  I plan to do a combo install of 10.6.8 later today to see if this remedies the situation.

Deleting and recreating the AirPort connection doesn't help this problem.  Neither does turning the AirPort on/then off, going from DHCP to FIXED IP addresses, or repairing permissions.  I even upgraded the firmware in the HP MSM422 access point from 5.4.29 to 5.5.1 and that didn't make any difference, either. 
Using the combo installer to reinstall 10.6.8 did fix the problem. 

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