I'd first start by applying the 14v3 update and see if the problem still persists.
Yes, but I'd still like to know if anyone else has had a similar experience (and if so, if .03 made any difference).
I think it's better to let the client know what kind of a proposition it is - 'just a tentative possible fix', or 'yep, other people had the same experience and this has fixed it'.
Have finally been able to confirm that the v14.03 updater does not fix this issue. The issue remains for a file originally created in FMP v10 (?) and converted; the issue does not exist for a file created in FMP v13.