[Elecraft] K3 can't key CW from Writelog

[Josh Fiden]

I'm trying to key CW via Writelog. Writelog only allows dtr for this. 
I'm testing using another program and this is what I've discovered:

1. K3 set PTT-KEY = Off-dtr and sending on dtr, K3 sits there like a bump.

2. K3 set PTT-KEY = Off-rts and sending on rts, K3 keys CW fine.

3. K3 set PTT-KEY = dtr-Off and sending on dtr, K3 "keys" the TX LED.

Problem appears to be K3 not responding dtr when it is assigned to KEY.

Any ideas?

Thanks & 73,
Josh W6XU