Autocad can't see some fonts

Some of my TrueType fonts won't load in AutoCAD 2011 on Windows 7. Some similar fonts of the same family are loading, but certain fonts (important ones, of course) don't show up in the Text Editor font drop-down menu. I even exported a dwg from Illustrator using the font in question, and it came in as substitued for the default face. Does anyone know what's happening? 

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