In the past I have been able to access my videos from iMovies with SnapFlow, where most of my videos are stored. But now, for some reason I can only access from other sources. I have always been a Mac user. How do I remedy this situation?
From time to time applications encounter errors that are impossible to explain. Just re-install the software and register it with your activation details and then use it again to select videos. It should work now since you will be downloading a new version of the software from its official website. Make sure that there are no other applications currently opened that use the files you also want to open. You can't have the same file opened in two different places to edit it.