Erez, you are actually not having any technical problem.
Your synth here: http://photosynth.net/view.aspx?cid=B9C73BFB-0948-4BA1-8F85-96AC0FD2F0DD completely uploaded and is available for viewing, so it published just fine.
The '71% synthy' score simply means that Photosynth was unable to connect all of the photos. This is either because the subject that you were taking photos of had no unique visual patterns on it (the blank white walls and fluorescent light bulbs, for example) or is something which changes shape too much (ocean or lake waves, or a flag blowing in the wind for example), or the photos were simply taken too far apart from each other or were too blurry, too dark, or too light.
The score means that 71% of your photos did match each other, but the other 29% could not be matched.
With a little practice, you'll learn how to conquer tricky photographic subjects and learn what Photosynth matches well. http://photosynth.net/help.aspx#photosynthhelp