Your post was 6 years ago. I was wondering how you had it solved. I am having similar problem with circuit shape. It's a long bike ride so I edited by batch of 20 clips. It happened when I edited on the first batch but later on it re-appeared, thinking it was just a glitch. When I edited the second batch of 20 clips, it happened again, but I don't know if it ever coming back. Maybe I have clicked something. Did you solve your problem of the vanishing circuit shape? Thanks!