Developer shows up at my desk, anxious about a document we last looked at four or five years ago: the .pdf has .tiff previews instead of clean vector graphics.
Step 1: open the .book in trusty FM12 [why I've not been able to install TCS successfully is a separate saga] and take a look. The referenced graphics are displaying the .tiff preview, as I'd expect, but double-clicking doesn't launch Illustrator. (as far as I remember, it's still working in other .fm files)
Step 2: without touching anything, run Save as PDF again … the result is a perfect .pdf with clean vector graphics.
Any advice on avoid/resolving either problem will be welcome!
It seems as though Windows managed to lose the "open with" preferences, though I'm even-handedly ready to suspect Adobe as well since this happened the same time as I updated Illustrator ;-} I have now reinstated Illustrator as default for .eps and – fingers crossed – everything appears to be working as I might hope.