In my case (11.**), the setting behaves at its own will: I've been used to swithing it to 'automatic', but it's always switching itself somewhere else - so I see flash content one times activated, other times to click to make them (Blackbird was saying it's related to this "Turbo-Schmurbo" thing).
@gram2six. What are the parameters of your connection? If it's fast enough, I can only see the point of enabling 'Turbo' if one needs going through the proxy sometimes.