Checkboxes on Value List Won't Work

[bookblender]

I am adding a basic value list to my layout. When I format it for checkboxes, the checkboxes won't "check". It also stops another very small checkbox already on the layout from functioning. When I delete the second value list field, the first, previously working checkbox field still won't work. I've reinstalled the FileMaker Pro 5 software, remade the value box and field from scratch, and the results are the same.

The Value List I'm adding has 39 items on the list with a maximum of 18 characters each. It originally had hyphens and slashes on some of the items. I have since eliminated any character that isn't A to Z.

I am on a Mac G3 with an 8.6 OS.

This should be a very basic install. Any one have any suggestions?

Thanks much, Rich