Project gone!!!

My projects have completely vanished. All the versions that I made and all the files seem to have been totally erased from my computer. It’s as if storyboard pro just jumped back a month, one of my other projects is still there, but not the latest version, and the new one has totally vanished.
This is about a months worth of work that has been lost.

Please help!!!

Hi, Macky,
Where did you save your project files ?
Which operating system are you using and did you restore your system recently ?