Just a question if anyone can help. I've downloaded the 123dapp program to my pc for the 123dapp challenge but it keeps closing out/shutting down when I try to do anything with the prim. I've already searched this topic on Autodesk site and found an older thread about it but no fix. Is there a fix for this to stop this from happening? I've also unistalled and reinstalled the program and it's still behaving the same way.