That did the trick. I had to delete this block of code:
{
"uri": "widgets/Splash/Widget",
"position": {
"relativeTo": "browser"
},
"version": "2.5",
"id": "widgets_Splash_Widget_49",
"name": "Splash",
"label": "Important: Offline notice for server upgrade",
"config": "configs/Splash/config_Important: Offline notice for server upgrade.json",
"visible": false
},
I have a ticket in with Esri support. Hopefully we can get to the bottom of this because I would like to have a splash screen. Plus, I really don't want to have to manually delete a block of code every time I update the website.