Setting up the numbered styles carefully, as discussed in the article by Shauna Kelly, is definitely the way to go. :-)
That said, when numbers are "blacked out," you can often fix the problem by running the following macro created by Doug Robbins:
Code:
Sub FixNumberingLevels()
'Macro created by MVP Doug Robbins
For Each templ In ActiveDocument.ListTemplates
For Each lev In templ.ListLevels
lev.Font.Reset
Next lev
Next templ
End Sub
See
http://www.gmayor.com/installing_macro.htm.