Three files which were already edited or in the process of editing when we ran the last series of transformations now need reworking, so we figured out what needs doing to each (each being different). I've rewritten my transformation from the other day so that I can switch on or off various aspects of it, and made some progress with running it on two of the files, but in the process of doing this a new, more serious problem emerged, concerning data which was lost from one or more of the files during a previous transformation in 2006. We think we know what triggered it, and we also think we know which files might be affected; if I can work back through blog entries to confirm exactly what was done, in what order, to the dataset, we should be able to make the same changes with some minor alterations to undo the damage. But this is going to be significant work, so it might have to wait until the fall.