I also have the same problem (Mac version), I recently saved my rhino file on my desktop and I quit the program. I opened the AI program and use it for a while. Then I go back and look for my Rhino file on my desktop and it just disappeared. I opened the Rhino program and it also disappeared, but other files were still there, only the file that I was looking was gone. I didn’t delete or rename or move or anything. IT JUST DISAPPEARED. If anyone know how to fix this problem, please tell me asap the project is send tomorrow.
See this thread.