A common issue we enoucnter is when a caller cannot see their True Type Fonts in AutoCAD 2011 on a 64 bit Windows 7 Operating System. Unless you zoom so far away you cannot read the text.
This issue is caused by using the Migrate Settings options in AutoCAD 2011. Uninstall all existing Autodesk Products. Then perform a clean reinstall of AutoCAD 2011. Then setup your AutoCAD Profile manually.