I have had this problem for days now. At one point it did finalize, but then I had to make some changes and had to try and re-finalize. It still wouldnt work. Just today I went to Share at the top right of imovie and selected IDVD, it took a few hours, but then transferred the information to iDVD and I created the dvd homepage and then I was able to burn the disk and it worked.... I am doing my second project right now... and it is also working!!!! I am still unsure why it wouldnt finalize, but just happy I am getting something to work!.. hope this helps for you.