Thanks Jared. So is this a property of the Canon camera or an oversight in the software? Even if it's nothing that SGP can predict, it might be a good idea to put a warning message next to the "settle time" field and mention it in the documentation.
In any case, I'm back in business! I did have a couple of frustrating nights trying to work out why my camera suddenly wasn't working so hopefully this experience will help somebody!
Thanks,
John.