NodeReference Explorer produces ineffective radio-buttons after a filter is applied

I am using NodeReference Explorer on a production site, and have just noticed this bug.
Reproduce-able by the following steps:

• 1. from a Content 'Edit' page, pick a NodeReference field, choose 'Browse'
• 2. NodeReference Explorer pops up, displaying filter options followed by first page of results (nothing surprising so far)
• 3. Choose a filter. Let's go with 'Node: Type'
• 4. Click 'Apply'
• 5. the first page of results is now replaced by the filtered results, however
  • listed rows are no longer selectable - you can click them, but they don't get highlighted
  • each row, under the 'Node ID' column, now contains a radio button - which is selectable
  • even if the radio button is selected and submitted, no results appear in the NodeReference field on the Content 'Edit' page

I'm sure this is probably a quick fix, and would love to see a quick solution!

Thanks for your help,
Adam