This happens on 10.4.0pr2 on Win 7 SP1.
Run a search and then pop up an (Word count) Analysis tab. No buttons in the dialog respond, nor can you click check boxes or move items in the table of parts to display. You then have to crash out Acc. to regain control. My example search in case it matters was "[RANGE MATT] <AND> [COUNT -20]" against the GNT28-T.