Problem:
If you animate and double clicking on a variable that has a NULL value, the examine box comes up.
When the Change button is clicked it might be expected that a 'box' is displayed as the ASCII representation of the NULL value. Instead it might only display spaces for the NULL values
Resolution:
Changing the Examine Results Font to 'Courier New' displays a 'box' for the ASCII representation of NULL values. The customer was using the 'Terminal' font.
Click on Options | Customize. On the Fonts tab select Examine Results, click 'Change' and select the appropriate Font.