Hello ShadenFreude, I experienced something similar on one of our machines (HPz840, Win10 64bit, Avid MC 2018.12). V1 till V5 was fine. As soon as I created V6 and so on, every track was duplicated. 2x V6, 2x V7 .... In my case it turned out that my avid mc user settings were corrupted on that particular machine. I deleted them locally, imported again