ARRRRRGH! (and I say that not because of NTLAPD...)

I am working on a book in InDesign CS (which needs to go to the printer today, natch), and FF Bau regular is acting up.

It keeps substituting individual characters from the expert set, or from another typeface, willy-nilly.

As you can see, the last two lines are gibberish.

If I change typefaces, or even weights of Bau, and then switch back to regular, it fixes itself.
Until the next time I open it, of course, when it reverts to its old messed-up self.

Now for some reason the last two lines are ok, but the date after Derrick's name has gone screwy.

Any suggestions?

I've trashed my InD preferences, I've cleaned my font caches, I've installed new versions of Bau direct from FontShop (thanks, Ivan!), but nothing seems to work.

Any ideas would be greatly appreciated.

Thanks,
ben