XSquawkBox 1.3.3 beta 3 has been released and is available on the download page.
Beta 3 adds some stability fixes to prevent XSB from crashing when it is unable to initialise VATSIM voice support.
It also removes the long obsolete transponder control item from the menu. Transponder control via the transponder in your aircraft will continue to work as normal.
This beta expires on 4 June 2017.