@nn4e - Version 0.3.3 of Wizkers:Radio was just approved on the Mac App store. This version fixes the issues you experienced on the KX2. Once the update goes through on your computer, let me know if this works for you!
Another nice update that is relevant to Mac users is that you can properly save instrument settings to a file - especially useful once you have many memory cards - as well as save PX3 screenshots.
An Android update will be released a bit later, but the Android version was not affected by the issues described above as far as we can tell.