Hey -
Does the crash happen when opening any level while another level is already open or does it only happen when loading a certain level or with a certain level already open? Have you had the same thing happen in any other projects with multiple levels? Also, are you opening the level by double clicking on the level icon in the content browser or are you using File->Open Level? In your projects Saved->Logs folder, could you send us a zip of your log and dump files from when the crash occurred.
Cheers