Hi Marianna, I'm getting some more bugs on the 2018.12 version. I'm the AE, and my boss is having issues on his system. System is Mac OS High Sierra 10.13.6, 16 GB ram. Working off graids, doing a lot of multicam and ediitng groups. Multiple video tracks. His sequence has been duplicating his V2 track so he has two V2 tracks. Avid is duplicating