Ive read a lot of comments about this issue, I had the same problem and I fixed it by clicking on....... SAFARI> preferences>security>web COntent> enable java plugins and enable javascrpit. and it worked for me i did not need to uninstall and reinstall adobe flash.
I didnt enable Java, i enable java scripts option and plugins i gives for options i only selected those two. and if i unselect them then adobe flash doesnt work again. IT works for me just I honestly hope it works the same for oters.