Circle Bullets not showing up in Word

Since switching to Office 365, circle bullets in existing documents (compatibility mode) do not show up. 

Clicking on the drop down next to bullets shows the preview as blank. If I then click on define new bullet - symbol - the circle is highlighted in the list. If I click the circle from there - OK, the circle bullet is applied throughout the document and is visible but upon saving, closing and re-opening, they are gone again. Additional info:

Version 2004 (Build 12730.20270)

Square bullets are not affected

It is the standard built-in circle bullet

The bullets show up if the document is printed.

The bullets do not show up when converting to .pdf.

I have tried deleting the Listgal.dat file.

In a new document I can't get the circles to display at all.

Any help is appreciated!

Carianne