Originally posted here in the "Retroactive Tome Change" thread.
We've done some more investigation, and here's what we're going to do:
Currently on the servers, inherent bonus suppression is applying to all characters. If you ate a no-minimum-level tome two years ago or today and are under the current minimum levels for the bonuses, the inherent bonuses that the tome applied being clamped. (+1 for levels 3-6, +2 for levels 7-10, +3 for levels 11-14, +4 for levels 15-18, and technically +5 for levels 19-20.)
We're going to go implement what was our original plan.
If you ate a no-ML tome (or eat one over the next few days), on patch day the entire bonus will express itself fully, regardless of your character's level. On patch day, any leftover old tomes will be replaced with new tomes (that possess standard minimum levels).
You have a little bit of time to voraciously consume any no-ML tomes you might possess before they're replaced. They'll temporarily be suppressed, but they'll express their full bonuses on patch day. (If you ate a no-ML Intelligence tome, you may want to hold off on leveling until after patch day to get the full bonus.)
When you lesser or greater reincarnate a character, all tomes will be applied using the rules that new tomes follow. (+1 at level 3, +2 at level 7, +3 at level 11, +4 at level 14, +5 at level 19.)