Using OS X 10.9.5 "Mavericks". Downloaded HSW12-master folder, the HSW12.app launches (Gatekeeper does prompt on first launch), icon appears in Dock and Menu appears briefly--but no windows open and the app closes immediately.
Running HSW12.app/Contents/MacOS/HSW12 in terminal does not output anything.
I can still run the program using hsw12.pl, after having installed XQuartz and perl5 + p5-tk from macports.