I don't really follow the ultra-technical answers from Rustyben, which is a shame as I"m recently experiencing the very same problem on my Xfinity stream when played on my PC (by logging into my Xfinity account in Firefox). The weird thing is that the picture USED to look FINE. i.e. it was not squashed with the annoying extra set of black bars on the sides. The even weirder thing is that when I log into the SAME account via my iPhone's "Xfinity Stream" app, guess what doesn't get squashed? The very same channel that DOES get squashed on my PC!
Again, 1) the problem did not exist previously.
2) the problem is device-sensitive....it occurs in Firefox at www.xfinity.com/stream but doesn't occur on an iPhone logged into the same acccount and watching the exact same programming at the same time!
I should note I also don't see the problem when watching on my HD tv either.
I was hoping there was perhaps some Xfinity setting within their website, or even perhaps my PC, that could set a different aspect ratio, but it's sounding like "not"....it's sounding like this is jus the way they're sending the signal now, for whatever reason.
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