unplug the TV from the wall. then plug back in. if that doesn't work, try to switch to a different APP, or use the INPUT button on the remote to cycle through your inputs to get back to your TV source (HDMI cable box, OTA, coax, whatever)
Math Geek. Tried the exit, back etc. finally tried input and hit vizio$&@(numbers) and it went back to cable. Very strange. Always used exit. It works with Netflix but on Amazon I have to go to the input and select the TV. Very strange. Thanks for your reply !!!
interesting. if it persists, you can reset the tv through the settings menu the way it came out of the box. will have to set up network again and sign back in to netflix etc but may undo whatever happened to cause the odd issue.