Unity deletes my scripts!

I have a problem where Unity will sometimes delete the script I am working on. I will then find it in my recycle bin. Even if I create a new script with the same name and the default boiler plate code (C#) it could soon be deleted. It doesn’t happen frequently but when it does it can be a real PITA.

I’m using 4.3.3 free edition, updated today and that still didn’t fix anything

Thanks

Solved, I was using Ubuntu-One as an impromptu cloud-back-up solution, and that was leaving lots of tell tale conflict files, so I suspect it was that! Stopped using it right away, and anyhow its shutting down soon.