Whenever I see the name MATROX appear, that makes me suspicious that that is what is causing problems. Can you replicate it with a non-Matrox project?
But the project is the 24,000 MB. When I open the folder where is was exported with 24,000 MB. The problem is when I open a project with Blu-Ray 1280x720 in Adobe Encore CS4 he is with 14,000 MB