In the now-defunct 8.6.2 (but possibly relevant for those preparing 8.6.3), I notice that nothing happens when I open up SubCap and click on "Export Caption Data..." or "Edit Master Caption List..."
"Import Caption Data" works fine.
Everything works fine on 8.6.1.
System is NOT one of the ones on my profile - it's a 2008 Mac Pro running OSX 10.9.5.