This thread has given me some hope. I am an amateur at this stuff. I have never had trouble exporting anything out of fcpx until a recent 13 minute cheesy home video, 19 titles, 10 added music files, 50 different transitions between pictures, one motion template that I changed to a video file, two free effects from FCP.CO . I have tried to export to Apple TV settings 1280×720 multiple times with hours of rendering and me canceling or just coming back in the morning to find nothing in the share monitor and no output file. I have rebooted, deleted share folder in FCP , deleted all render files by menus , deleted render folder on hard drive, bought compressor but same results. I have made one new project and it exports fine. I removed the third party effects but not help….
Now, after reading this I will try outputting to full pro res. if this doesn’t work I will try exporting ( share) the second have of video as per this thread. Experts like yourself help more than just yourself when you post. So just wanted to say thank you in a long winded way. Der