Thanks for updating to 2.1 but...
I loaded my 2.0 save into 2.1 and at least some of my circuits are blank when I open them. It may only happen to packed circuits and on space platforms. I have been able to get the circuite to render after some amount of disabling packing and closing and reopening the editor view.
Sorry about lack of exact reproduction steps. If desired I will attempt to nail down the reproduction steps. I am also willing to do some debugging on this if you push me a bit in the correct direction.
