That is most likely an cache problem…
The solution is indeed a reboot from the stock ATV settings app (Settings -> General -> Restart AppleTV) or the menu and down button method…
I think you just restarted lowtide from the maintenance app…
You could also try to ssh in your ATV and get a terminal running and do the following commands (as root):
“uicache”
“reboot”
after those commands your ATV will reboot and the cache is cleared…
Good Luck 