Font Book does not Install all fonts
I'll bet you have a font corruption problem.
- Split the uninstalled fonts into two groups.
- Import the first group.
- 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.