At very high levels a mage doesn't always get a new spellslot at level-ups.
As for the highlevel abilities, that's no bug. All the highlevel abilities for a f/m/t or f/m/c can't fit into the box where you select them.
As you're only supposed to become a level 17 mage (no 9th level spells) I suppose the developers decided to leave the mages highlevel abilities out (since most of them are 10th level spells, which you won't be able to cast).
Anyway, Sabre once made a fix so you were able to get your mage abilities after all.
You should ask him, if he would be so kind as to send it to you. Or check his site. (I believe there's a link to it at the buttom of his posts)
-Sylvanerian
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Qualis Artefix Pereo
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