HI,
Crashing can be caused by a number of things. Try some of the troubleshooting methods below to see if you can solve the problem.
Assuming that you are using iMovie 10, try opening iMovie while holding down the Option and Command keys and selecting to delete preferences in the box that appears. iMovie will open in a new library. Reopen your old library to get back to your project. Now see if you can share without crashing.
If the above doesn't work, try doing an Edit/Select All, Edit/Copy of the media in your project and then Edit/Paste it into a newly created project. See if you can share from the new project.
If still no luck, try booting up in Safe Mode (see Finder menu for instructions) and, after everything loads, immediately shut down and reboot in normal mode. See if that cures it.
If still having the crashing, it is possible that there is some corruption in your project that is causing it. Try scrolling slowly through your project, looking for white flashes, black frames, artifacts and any other evidence of corruption. If you find any, cut them out of the project. Then see if you can share out.
-- Rich
