It appears to be a compatibility problem with Safari, Xfinity and Flash Player. It's got to be something that was changed on Xfinity's end; I've been using the same setup for several years to watch TV on my desktop iMac, and it's always worked. I got a new computer back in December, and it worked fine until last week. Now I'm getting this error. What's weird is I can still go to various network websites and watch there, and I have to sign in through Xfinity.
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