Word heading number blacked out

Question

When opening the document I am working on in Word 2010 this morning, the number in heading level 1 is a black rectangle:

however, it still look ok in the bookmark pane:

Weird, ey?

Answer 1

I solved this after all, I also noticed that someone else was unable to resolve this on a Microsoft forum, so if you read this, here is my solution:

1. Press properties for Heading 1
2. Press format, numbering
3. Chose No numbering. Exit the properties. All numbering will now disappear.
4. From the "start" pane, press multi-level-list, and then the format that looks like:

1. Heading 1

1.1. Heading 2

1.1.1. Heading 3