Você pode tentar excluir suas preferências do Flash:
rm -r /Users/<username>/Library/Preferences/Macromedia/Flash\ Player/macromedia.com/support/flashplayer/sys
mkdir /Users/<username>/Library/Preferences/Macromedia/Flash\ Player/macromedia.com/support/flashplayer/sys
rm -r /Users/<username>/Library/Preferences/Macromedia/Flash\ Player/#SharedObjects
mkdir /Users/<username>/Library/Preferences/Macromedia/Flash\ Player/#SharedObjects