[swfmill] font issues

[nils@hub124.co.uk]

I've been trying to follow the dynamic embedding tutorial here:

http://www.deja-vue.net/blog/2006/05/26/as2-sharedfonts-datagrid-example-the-last-stand/

which basically uses swfmill to create a shared font library.

Everything works fine but the font I want to use isn't aligned  
properly - text in textfields is moved up by up to 20 pixels.

This is only a problem with swfmill and only a problem with some fonts.
The font in question is Avenir from Linotype in TTF format.

I'm guessing it's something to do with the font's metric information -  
is there a solution?

Thanks - Nils.