Hi guys - having exactly the same problem here. VS premium, Win 7. Win7 updated last night, but have reinstalled as previous and can cast from everything except Videostream! Youtube etc no probs whatsoever.
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RE: Unexpected error Chromecast/Videostream
@grahamkennery You just fixed it as in 1) you're a VS dev and it's now fixed for everyone, or 2) you just fixed it for yourself? If 1) amazing, I'll get right not it if 2) you're a lucky swine but have tried that twice myself to no avail.