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User profile for user: Rigadon1
Rigadon1 Author
User level: Level 1
10 points

iMovie Green Screen malfunction

I'm working with iMovie on my iMac. I have a background image on the lower timeline and an image with green background on the upper one. I select the upper greenscreen clip which highlights yellow. I go to the dropdown menu which is defaulting on Cutaway and select Green/Bluescreen. It defaults back to cutaway. No matter what I do, it will not let me select Green/Blue Screen. I rang Apple who suggested I create a new login - no dice. Can anyone help?

iMac 21.5″, macOS 10.15

Posted on Oct 25, 2020 2:16 AM

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User profile for user: Ian R. Brown
Ian R. Brown
User level: Level 7
21,078 points

Posted on Oct 25, 2020 2:52 AM

I don't know what's causing the problem but try this as a first step . . . .


If iMovie starts behaving unexpectedly in any way for no apparent reason, the problem could be caused by corrupt preference files. 


The cure for this is to delete the preferences. 


 Hold down the  Cmd and Option keys as you launch iMovie and a window will appear asking if you wish to delete the preferences. 


Click “Delete Preferences” and iMovie will open in the default (as-new) mode with no projects etc. on the interface. 


You will have to navigate to any project you were working on and reopen it. 


Deleting preferences is completely safe and because of its simplicity it should be the first thing you do when troubleshooting.

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Question marked as Best reply
User profile for user: Ian R. Brown
Ian R. Brown
User level: Level 7
21,078 points

Oct 25, 2020 2:52 AM in response to Rigadon1

I don't know what's causing the problem but try this as a first step . . . .


If iMovie starts behaving unexpectedly in any way for no apparent reason, the problem could be caused by corrupt preference files. 


The cure for this is to delete the preferences. 


 Hold down the  Cmd and Option keys as you launch iMovie and a window will appear asking if you wish to delete the preferences. 


Click “Delete Preferences” and iMovie will open in the default (as-new) mode with no projects etc. on the interface. 


You will have to navigate to any project you were working on and reopen it. 


Deleting preferences is completely safe and because of its simplicity it should be the first thing you do when troubleshooting.

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iMovie Green Screen malfunction

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