What is the EBS version?
Did you freeze the definition? Verify that the launched concurrent request does finish without error as this could be one issue.
If frozen and no errors on the request, enable the displayed checkbox to see what value is being set as the Context. After that, try clicking the sync with reference field checkbox.
Remember to switch responsibilities to make sure the changes take effect is using the lookup form on the same one you are defining the DFF, as definitions get cached.