ComboBox in Subform won't allow selection

[nastar1]

I've been modifying what was a working subform by changing all the table and field references. Something I've done has made the combobox in the subform inop. The list of items is displaying, but when I try to select an item, nothing happens.

Any ideas what I can check to isolate the cause?

Are indexes in the tables involved? Though I have checked them to make sure all the new names have been made, perhaps I'm overlooking something there.

 

[nastar1]

Nevermind. I found the problem. The ControlSource did not change correctly. I went back and compared the combobox properties in the original database.