Monet freezes opening a setup

I worked on a shot yesterday, saved and rendered and tested several times. Today I wanted to continue my work on the same setup and when I try to open it, Monet just seems to freeze.

I created the setup on Win64 with Monet 2.1.1 (I know… not the latest version but not my machine) and I also try to open it on my own machine with Monet 2.1.2 under OSX 10.5.2 with the same result that Monet just freezes.
I also tried to delete cache files but it didn’t make any difference.

Is there anything I can do? Any idea what to do? All work gone?