Hi Andrés Moya, Thanks for your feedback! This prop will pop up same msg in iClone 7 as well. The reason why AP show up that msg is because the mesh you have selected name as Lego. "Lego" didn't have any poly count, so it won't be able to turn physics as well. If you select the 2nd node name as "base", it can turn on physics sucessfully. Calvin Reallusion.