I've has chromecast for years and it has worked perfectly well until yesterday when it started to cast in the wrong aspect ratio to the TV. Instead of 16:9 the picture now looks like it is compressed to fit 21:9 and is utterly unwatchable.
I have not messed with any settings in the TV or chromecast and it does not matter from where I cast, PC, phone, in apps or from chrome.
What could cause this issue?
Thanks for reaching out. What type of Chromecast device do you have? If you have a Chromecast with Google TV, could you please check the aspect ratio set in the Display and Sound settings? Also, reboot your Chromecast and plug it in on a different HDMI port on your TV.
If the issue persists, plug it into a different TV screen if one is available so we can isolate the issue.