Bug fix for Flash Game

I have a Flash game that gives the person a task along with countdown timer. After the time is up, the game should end and then submit the scores to Mochi. Recently, it has been noticed that after the countdown timer expires, the time does not end at 0, but instead the countdown timer keeps ticking and goes into negative time. Instead, when timer expires it should end game and automatically submit score to Mochi. I've noticed the negative timer glitch only on a MAC. I don't know if it's because of Flash drivers v12. Have the Actionscript FLA and SWF to help you fix this. Because of the project nature, you will first have to fix this glitch first before payment is made. If you are very good, it should only take you a few minutes. I have an amazing feedback so there should be no worries. I will continue to use you for future Flash games if you pass this case.