Is Update Game Working?

When I try to "Update Game" my game no longer works. I am only seeing a black screen. Any ideas on how to fix this problem, or do I have to upload it from within the APPLICATION?
Please let me know.
Please let me know.

Comments
well, I have been uploading for three days with no problem, however today I could not upload my game. I did make sure I was EXPORTING the game. It does not replace my old version. I made sure safari cache was empty.
Any idea what has changes since yesterday?