BUG Can Not Open Doors - Can Not Play The Game !!!!!!

• When did the Bug occur?

- started Dead Space 3 and loaded my checkpoint (chapter 3 / tunnel with dogs)

- now i can´t open the doors

- reloading the hole chapter 3 

- can´t open the door at the space ship and can´t go inside

• What did you do before you experienced the Bug (please be as detailed as possible)?

- played Dead Space 3 first time

- leaved the game at chapter 3

• System
  

- PC

- Version: German / Retail

... I can open the doors at the lower checkpoints, but there´s no way to get into chapter 3