Welcome to the Version 12 Beta page.

Here you will be able to view the list of fixes/changes between Beta builds. Please pay particular attention to the "Limitations and Known problems" list, as this will change with each new build.

To submit feedback on issues you find in the Beta versions:

  • Firstly identify whether your issue is happening repeatedly or not. If you continue to experience the same issue doing the same steps, please directly submit a ticket using the Redmine ticketing system:

  • If your issue is not repeatable or you are unsure about how the application should be working, please first discuss the issue in the relevant category on the Lightworks Beta Forum section:

  • If your thread in the Forum concludes as an issue within the Beta version, please sumarise the thread and enter a ticket in the Redmine ticketing system:

You will be able to sign in using your Lightworks Username and Password, if you are already signed in to the Lightworks Website you will be automatically signed in to Redmine. Detailed instructions on submitting useful information can be found on the Wiki page. Please make sure you have searched for the issue before submitting a ticket, this should help stop duplicate tickets being submitted. The more feedback we get, the faster we can resolve issues.

IMPORTANT: Any users running Blackmagic hardware will need to upgrade to the latest Blackmagic drivers 10.1 and higher, otherwise the Blackmagic Device will not be recognised.

Cross Platform Fixes and Features Since 12.5.RC7 Release Candidate:

  • Fixed newly created edits behaving very strangely when dragging and dropping the first clip to a timeline in a new 'Auto' frame rate project
  • Fixed timecode error in Multicam bins after using slip trim on V track only
  • Fixed sync-time calculation for edits (which refer to edits)
  • Fixed potential crash exporting an AAF
  • Improved edit backup procedure to resolve performance issues with large edits, primarily during audio mixing (config.dat entry required: decoupleEditBackups 1)
  • Improved performance during playback
  • Added key assignable commands for setting various play speeds (to improve Shuttle Pro shuttling)

Mac OS X Specific Fixes and Features Since 12.5.RC7 Release Candidate:

  • Fixed potential crash enabling Fullscreen output (F12)
  • Fixed potential crash exporting a bin of edits

Windows Specific Fixes and Features Since 12.5.RC7 Release Candidate:

  • Added support for Matrox Utils version 9.5 SP1 (
  • Fixed incorrect 1080p 23.98 Quicktime Movie exports
  • Fixed exported audio duration being too short for related NTSC frame rates (23.98 etc.) in Quicktime (32bit only)
  • Fixed hang/crash exporting a bin of edits as Quicktime Movie (32bit only)
  • Fixed Mackie fader automation entry sending zero values when fader pressure is released (Win 32-bit)
  • Quicktime Movie export frame rate is now changed automatically when you set the export frame rate in Lightworks

Linux Specific Fixes and Features Since 12.5.RC7 Release Candidate:

  • N/A

Changelog archive:


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