Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
AirPlay Video Streaming Is Enabled in Safari (+ other apps)
Good job, Hackers !!!
I never had any doubts in your abilities to bring AirPlay Video streaming to the third-party applications, as it was done by Erica Sadun. But you’ve overextended yourselves having produced a hack, that brings this feature to All the apps ( Apple Safari among them).
This tweak can be downloaded from the Cydia Store :
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