Structure Free 1.5 working differently in 2 identical sessions

[Fritz]

long shot but ...

I have a PT 2023 session with Structure Free 1.5 inserted on 3 instrument chans.
They are set to trigger kick, snare and hat respectively. 2 samples/keys on snare (for rolls and same for closed HH)
All fire from the Virtual midi kb (octave C3) properly.

I have built the same session for a drummer to overdub at home on a demo of PT.
But his Snare triggers both the kick and snare from the snare keys.
And both the kick and HH from the HH keys.
I've doubled checked all the settings, but alas ...
All are midi ch A1.


I wonder if there is some kind of corruption of PT since the Structure free plug in was installed by zipping the plug on my system; and unzipping and drag and dropped after the install to his.
Perhaps Structure 2 is automatically installed with the demo and PT is now seeing half Structure 2 and half Free 1.5?
The version of StF for his session is the same as mine 1.5.11 ...
Or maybe there is something else I'm missing.?

I did have him run DFA and restart after the install.

The only difference is he is on Catalina and I'm on Monterey.