Hey,
First you're aware that Final Cut saves automatically? But I don't think that's your question.
From your image it looks like you're trying to export a whole event as video file. Careful what you've got selected before sharing. Are you not just trying to share the video you just created? I wonder if you had the projected selected or if you were actively clicked inside the timeline it would work.
Good luck,
James.

Have you copied your video files off the SD card and into a folder on your hard drive somewhere? Sounds like Final Cut is still working with the original files straight off the camera.
James.
Looks like you were still working off SD card. Put it back in and see if that helps.
Before exporting click on the timeline then export. If you click on a clip in the library it will only export that clip.
Hi james,
still having problems, do you have Skype / team viewer where you can remote in on my mac and see what I am doing wrong?