Did you do a system restart after removing the channels? If not, they aren't really removed. Either use the System restart function in the Settings menu, or pull the power for about 30 seconds.
Dan Roku Stick (3600), Ultra (4640), Ultra (4670), Ultra (4800), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Nvidia Shield, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.
Try the "clear the cache" routine - on your Roku remote, press Home 5 times, Up once, Rewind (<<) twice, and FF (>>) twice. If you did it correctly your TV should appear to lock up and then reboot. Please report back to say whether it helped or not.
Way to go @renojim !! So excited that this worked. I have to admit when I searched and this came up as a solution, I was like "yeah right!" But I followed your exact directions and TV did appear to lock up then turned off and back on and apps work!! THANKS!
"Try the "clear the cache" routine - on your Roku remote, press Home 5 times, Up once, Rewind (<<) twice, and FF (>>) twice."