Videos suddenly stop playing in my presentation
I am inserting 11 short clips of a video in my presentation. All goes fine but then I change some text and suddenly all the videos stop behaving as videos. The image of the video is still there but no arrow to indicate it can be played. When I play the presentation the videos don't play. In the editor the edit video section of the Movie toolbar on the right is greyed out. I try deleting the video clip and reinserting it but Keynote says it can't be inserted.
I am using several different clips of the same video.
Has anyone any ideas?
MacBook Air, OS X Yosemite (10.10.2), Keynote 6.5