10.5.6 update - NO access to some external FireWire hard drives

Have been capturing footage, editing, etc on external Western Digital MyBook Premium hard drive lately, including last night, and everything HAD worked fine under 10.5.5.
Just installed 10.5.6 update before going to bed, this morning Finder doesn't recognize same external MyBook hooked up via FireWire.
I tried:
(*) Reinstalling WD "button" software for MacOSX and rebooting... drive doesn't appear,
(*) Cycling power on external HD... drive doesn't appear,
(*) Different FireWire ports... drive doesn't appear,
(*) Disk Utility... drive doesn't appear,
(*) System Profiler... reports FIREWIRE BUS--> UNKNOWN DEVICE
Note: my old-school Granite Digital external FireWire drive does get recognized by both Finder and Disk Utility, so maybe it's only some external FireWire drives like the MyBook?
This may be related to similar thread in Leopard discussions about TimeMachine no longer recognizing external hard drives.
Really bad timing (my fault for installing 10.5.6 before more reports were in), and hope Apple gets a fix for this asap.
Message was edited by: krisvannest

On the Intel iMac, resetting the SMC is as easy as removing the power cord for at least 15 seconds. - http://support.apple.com/kb/HT1543
Resetting PRAM involves the "4-finger salute" at start-up Command-Option-P-R. http://support.apple.com/kb/HT1379 You hold those down until you hear the computer make the startup sound again.

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