Font Book does not Install all fonts

I'll bet you have a font corruption problem.

  1. Split the uninstalled fonts into two groups.
  2. Import the first group.
  3. Check to see if they imported successfully.
    • If yes, you know the problem is in the second group, so go to step #1.
    • If no, the second group might be okay, so try importing that.

And so on.

You should be able to narrow down the problem without having to import each font one at a time. But my guess is that one or more of your fonts is corrupted.