[Elecraft] K3 Firmware Update for Mac OSX won't talk to K3 --?

[KM5Q]

System: Mac OSX 10.5.2.
I have the KUSB adapter cable.
I downloaded AND installed the appropriate Prolific driver for my OS,  
as instructed (PL2303 driver). Installation looked normal. I  
restarted, etc.



I have K3 Utility v. 1.1.4.1
K3 is turned on, connected to USB port.
Port -- after Refresh Port List, I hit Test Communications. It says  
"MCU boot loader is ready for MCU firmware load RS232 39400 bps."

Firmware --
I GOT the download of new files from Elecraft OK -- Utility shows MCU  
Available:  01.87, etc.

I hit Send All New Firmware to K3

This is as far as I can get:
20:50:09 New firmware is available for your K3
20:51:29 K3 boot loader is waiting for MCU firmware load.
20:51:44 K3 boot loader is waiting for MCU firmware load.

This is the same message I was getting BEFORE I installed the Prolific  
driver.
I don't think computer is talking to K3:
Crystal Filter Configuration shows all zeros

K3 Config still shows 1.78
I turned K3 off, then back on. No help. Am I supposed to do something  
at K3 other than turn it on?

Frustrated!
Windy KM5Q