Activity › Forums › Avid Media Composer › 2018.12 on Catalina Avid Media Composer 2018.12 on Catalina Posted by Jon Hensen on January 6, 2021 at 9:15 pm Is running MC 2018.12 problematic on Mac OS 10.15? Robert Ober replied 5 years, 3 months ago 3 Members · 2 Replies 2 Replies Pat Horridge January 6, 2021 at 9:45 pm Yes it’s not supported. Catalina dropped QuickTime and only MC 2020 has an alternative mechanism (called UME). Robert Ober January 7, 2021 at 2:02 pm Yep and I forget the exact month, but it’s something like 2020-10 before it works well as I recall. Take care, Robert Reply to this Discussion! Login or Sign Up Public All Members My Connections Only Me PublicAll MembersMy ConnectionsOnly Me Public All Members My Connections Only Me Reply to this Discussion! Login or Sign Up