Amnesia TDD Fullscreen crash

[RaffyDG]

When I launch Amnesia the Dark Descent (Mac App Store Download), It works for a while. Then, I open it one morning, the launcher comes up, I click on the play button. The fullscreen loads then a few seconds later, it quits. It happened more than once. Renaming the Frictional Games folder on Username>Library>Application Support> Frictional Games| worked before now it doesn't. I need help fast!
System specs:
GPU: nVidia 9400M - 256mb vram
CPU: Intel core 2 duo 2.4 ghz
Ram: 8gb ram.
As I said, renaming the Frictional Games folder used to work. All updates installed (the Justine expansion pack update)
If you need anything, I can try to provide it.