This is often an index problem so as a first step I'd insert a new record, delete it, and try the PACK again. Still no joy: do a DELETE TAG ALL and try again. In that case you'll need to recreate your indexes afterwards. Let us know if that does the trick.
"... They ne'er cared for us
yet: suffer us to famish, and their store-houses
crammed with grain; make edicts for usury, to
support usurers; repeal daily any wholesome act
established against the rich, and provide more
piercing statutes daily, to chain up and restrain
the poor. If the wars eat us not up, they will; and
there's all the love they bear us."
-- Shakespeare: Coriolanus, Act 1, scene 1
