I saved it into MIF format, with the flag "FV_SaveFmtInterchange" and, as far as I can see it, it worked well under the same conditions of the PDF creation crash (same everything, of course also same conditionals' show/hide pattern).

I opened the .mif file with FM7 and the contents seem ok (I'm not an FM technician so I'm not sure about how to do a fair check of a 250 pages book).

Can this test exclude the option of being a cross references problem?

Thanks,
n3u.