First bug identified for 1.0, but I don't think it's severe enough to warrant a new version. Instead, I've added a "Known Issues" section to the OP. The bug:
In the destiny screen, entering twists before choosing a main destiny will usually crash the program when you click away from twists back to the destiny tab. The bug is triggered when the destiny dropdown is blank on the destiny tab and not blank on the twist tab. To avoid the bug, always choose a destiny before doing twists. (You don't need to apply points to it.)