Can you post a screenshot of the timeline showing a choppy and a smooth transition?

Are there any indicators on the TC track? These would be blue, yellow, or red lines where the playback is choppy.

The Sibelius forum is here: https://www.sibeliusforum.com/

The big change with Catalina and later versions of MacOS is that Apple eliminated support for 32-bit apps. Quicktime is a 32-bit app, so that caused a lot of changes in the linking and importing functions of Media Composer. There are more details in the 2020.4 What's New document under 'MacOS Catalina Support': https://resources.avid.com

Hi, Try this: When you start Media Composer, press and hold the 'w' key on the keyboard, which should bring up the dialog box that allows you to choose between trial mode or MC First. If that doesn't work send an email to Chris Bové (chris.bove@avid.com). He is Avid's customer advocate, and can help you.

I would log out of Avid Link and log back in to force it to contact Avid. If that doesn't work, send an email to Chris Bové (chris.bove@avid.com) He is Avid's customer advocate, and can help you.

[quote user="k-lo"]I am not sure what you mean by "what plug-in" is being used. When I go to file/input/source browser, I can do Link or Import.[/quote] In the source browser select 'Link'. There is a column in the source browser that says 'Plug-In' which should automatically populate with whatever plug-in Media Composer

Which specific operating system are you running? [quote user="k-lo"]I tried linking the files and it is just black.[/quote] In the source browser, what plug-in is being used to link the files? If you click on the drop-down, are there any other choices that work?

Is there a 'publish' option? I think that's what it's called in the free version. If that's not it, have a look at this thread and see if anything in there helps: https://community.avid.com/forums/t/208450.aspx

Great News!!! Avid is pleased to announce the release of Media Composer 2021.12.8 today Tuesday May 2nd, 2023 Location at Launch: The Media Composer 2021.12.8 (Mac and PC) is available from the Download Center only. Status of Support Plan: The ability to launch this Media Composer 2021.12.8 software is dependent on the status of a customer’s Upgrade