[Project closed and disappeared]

I was making some sharp turns , and the project file I have a copy .

[Project closed and disappeared]

I was using the beta version 1.5.0.7 , and was working with the pen tool , and today happened this new problem , but as I had a backup had not lost anything.

[Project closed and disappeared]

Well, I was doing a project in AD , and suddenly , out of nowhere AD closed alone and missing (deleted) the project I was working on, anyone else had this problem?