Hi Jason -
I'm a PC user, so I'm a bit in the dark as to why the Apple Braille font won't work in AE. I'm wondering if, rather than a system font, the Braille font might be in some sort of "accessibility" mode.
If you're under the gun, here's a workaround - the Braille font is available as a free Truefype font for the Mac at:
http://www.searchfreefonts.com/free/braille.htm
If this installs and works fine in AE I think the Braille font on the Mac may not be your standard font as we know it. Good luck.
Joe Bourke
Creative Director / Multimedia Specialist
B&S Exhibits and Multimedia
bs-exhibits.com