I struggled with finding the solution to this big problem. I checked out all suggestions. Finally, I heard another poster say they updated their Apple software with the latest security update. I did the same and voila, it worked. So please update your security software and see if it will resolve your problem. Also, here is the version of Flash that I am using for Mac OS X 10.5.8. It is: 10.1.102.64. I hope that is helpful to you, as I know what a trial it is to find the solution. Best wishes, Alena.
Where do you go to get the security update?