It is also not working in my Windows 10 instalation.
While inspecting this, I have discovered that when I try to add a new 'Recorder' element to any disposition, it does not show up in the list of available elements to choose from. The only choices are "Recorder Play", "Recorder Stop", and "Recorder Record". Is this how it should be, or is something wrong with jOrgan. This is true for both versions 3.20 as well as 3.21.