Hello,
occasionally, when you open an attached scene, the 3 nodes on the left are not displayed thumbnails and the nodes is not active at all. It only helps to switch the Corona Select Shader or to disconnect and join the node in this area. I suspect the problem is the Corona Select Shader node.
Full-speed non-debug version
Build timestamp: Jul 15 2021 09:46:47
Version: 7.0 rc 3
Cinema version: R24.111 Cinema 4D
Windows 10 21H1 19043.1110