Either the DISH box settings have changed (my vote- been there, done that), or the source *channel* has changed in some way.
Which DISH box model are you working with? Without that info, we cannot begin to assist. This might save you a bigger headache and $95 charge.
I've lost the HD widescreen aspect on my TV. It's a Vizeo E24 1i-B1. It was working fine until a few weeks ago, when the screen changed so it's now too wide for the screen on all sides.
I called Vizeo, and they had me confirm that their menu settings were set to Wide and 1080, which it all is. They said it was all correct and I'd need to call my service provider.
So I called Dish, and they had me confirm that the menu settings were 1080 and 16:9, which they are. They had me try changing the Format sizes, but even shrinking the screen as small as possible did not help. They said it was all correct and I needed to call the manufacturer.
I could have a Dish tech come out to the house, but that's $95.
It doesn't make any sense, because it's been fine for about a year. I think one of the remotes may have been bumped, but I've spent hours going through all settings and buttons I can think of, but can't figure it out. If anyone has some insight into what I'm missing, I'd deeply appreciate it.