System.NullReferenceException when adding a particle cloud region which is not there at startup

[wouterverweirder]

I get the following error when I try and add a particle cloud region that is not at start up.
Process terminated unexpectedly.
Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object.
at MSKinectDevice.depthFrameHandler(MSKinectDevice* )
at MSKinectDevice.processThread(MSKinectDevice* )
at MSKinectDevice.processThread(Void* pParam)

Seems that I have to set the regions to blank before adding new ones.