I know your feeling, I got same problems like you on Pirates in Love.. There are no sound when I klick epilogue/ main story/ etc.. And some of my CGs disappear! And when I try to open the game story, suddenly The application close it self.. But after I delete my application and re-install my game it works like charm, but I lost all my data before..
I don't know if you still have that problem when you delete and re-install the game again..
Maybe you should send an email to Voltage?