There is a bug in the Macintosh toolbox DrawText which adds a white rectangle behind any text. If you use a 'alt shift dot', the white rectangle will appear in front of places.
A work around can be to use a bullet from the Zapf Dingbats font, size 9. See-bellow.

This is only a work around and I should change this for a future version of Macao because:

• You cannot analyse anymore your model because the AMI-Net checker will not understand that the bullet is equivalent to "1"
• The PostScript file generated (with the Zapf Dingbats font included) is 370K instead of 11 K !