Got a reply back from Tom (Mr. Win4K3) in short order…here’s what he said to do 
and now it works !

Hi,
The KX3 is usually set up by default to run at 9600 baud.  There is a menu 
option in the radio (RS232) to set it at 38400 which is what I usually tell 
people to do.
The Elecraft utility auto senses baud rate, so it doesn't matter but Win4K3 
doesn't so you need to have it set up in the KX3 itself.
Let me know if this fixes the issue please.
Thanks

What a great guy, great product and Elecraft-like support.
Life is pretty good :-)
73, Brian K3USC


> On Sep 4, 2015, at 4:49 PM, Brian Hemmis <bhem...@mac.com> wrote:
> 
> Haven’t used my KX3 in many months so I hooked it back up and went to the 
> Elecraft site and updated everything with no issues.
> As I recently purchased Win4K3 software and am successfully using it with my 
> K3 I figured I’d try it with the KX3. No luck.
> My KX3 shows up on COM4 on my computer (for the Elecraft updates) so I 
> initially tried that unsuccessfully then went through the other COM ports as 
> well.
> I tried the default 38400 baud rate as well as the 9600 baud rate. I also 
> retried everything with the K3 disconnected from the computer.
> I’m sure its some stupid thing I’m not doing and perhaps I should contact Tom 
> at Win4K3 but I thought I’d try here first.
> Any thoughts ?
> 73, Brian K3USC
> 
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