You've got a bug in the font height functions. They must not be scaled
with ToNatural.
Try e.g. the Tahoma font from Windows or any other font where
FHead.UnitsPerEm<>1000. You'll see wrong results.
Your example works because FHead.UnitsPerEm is 1000 for your version of
FreeSans. If you use an old FreeSans where UnitsPerEm is 2048, you get
wrong box height.
I needed about 2 hours to find it :(
See http://mantis.freepascal.org/view.php?id=30008
Ondrej
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