it comes to this problem quit often, so I think it could be good to tell you about: When I have opened several different grasshopper tabs and start to quit Rhino it asks for saving GH Files. At this new windows that asks for saving GH files I can not select anything, because my Macintosh starts freezing. When it comes to a frozen Macintosh because of single programs, I use force quit the program but this is not possible with rhino 7 WIP Beta. I can not even shutting down my pc, because rhino is blocking it. I hope that you can reproduce the error and fix it.