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Can't get Silverlight 5.1to work. Is in Ad-ons & always activate. 6??

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I recently ran MacKeeper and Silverlight stopped working. I have installed the new version of Silverlight 6, but it doesn't show up in Ad-Ons. My Ad-Ons shows Silverlight 5.1 and is checked to always activate. However when I try to load a movie, I get a message that Silverlight is blocked.

I recently ran MacKeeper and Silverlight stopped working. I have installed the new version of Silverlight 6, but it doesn't show up in Ad-Ons. My Ad-Ons shows Silverlight 5.1 and is checked to always activate. However when I try to load a movie, I get a message that Silverlight is blocked.

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Hi visualculture, Certain versions of Silverlight have been blocked because of vulnerability issues. There is still an option on the page it is being blocked to "Activate Silverlight"