Thanks for your reply.
That's what I did when saving. But when I re-opened Sculptor, the new design was not there. I think that a "save" button would be a lot better.
I'm using CS5 with Windows 7 64bit.
I deleted the cache file, but it change nothing, Sculptor is still crashing unexpectedly.
I don't see what I can do to make it more stable and I can't uninstall all my other software to find what is causing that.
Why not create a standalone version of this software? I think it's a great idea and I like the way it work but it so unstable that I can't use it.