Hi,
Found a bug in MS Word: This happened when reloading a document that used heading styles for numbering and included equation objects.<http://social.technet.microsoft.com/Forums/getfile/174029>
have a look at this discussion:
http://social.technet.microsoft.com/Forums/en/word/thread/447f7cac-1e6a-4990-be16-a823a437c0d4
Maybe, Kevin's answer will help you:
1. Put your cursor on the heading just right of the black box
2. Use the left arrow key on your keyboard to move left until the black box turns grey
3. Use the keyboard combination ctrl+shift+s, the dialog "Apply Styles" should appear
4. In this box, click "reapply"
Cheers,
Lisa [MS MVP Word]
