I have created some cck text fields and placed them inside a field group.
In Internet Explorer all I see is the "add another item" button, but no fields. If I click "add another item" the fields appear.
If the fields are moved outside of the field group, they appear as normal.
I think it is the table element that is being hidden.
This only occurs in Internet Explorer, all other browser I have tested including Firefox and Safari are ok.