Hah, that’s definitely an issue. I have never actually made a PRT Volume using the Creation Panel, so I never noticed this bug. I’m going to fix it right away, but I do suggest you use the excellent macroscripts Bobo has provided by putting them into a toolbar. It makes Krakatoa a lot easier to use, since the GUI and all the primitives are at your fingertips. franticfilms.com/software/su … cripts.php
It seems to work if you select a geometry object first, then press the PRTVolume button.