OK sebastiontombs, I had another go using a models folder. The next trigger was "cancelled":-
So, not the result I was hoping for but apart from the Error 100, I also noticed two other things:
1. The timing of the images now ignores my setting of 5 x 250mS
2. An image at T-xxx has returned
3. Something I never realised which is the image displayed in the analysis corresponds with the one selected in the list details
At least I've now learned where to put dark.pt when the wrinkles are ironed out - thanks.
Just seen 5.4.9.7 is out. Can't resist....