PowerApp forms get stuck on "Getting your data..."

If it's an Edit form, make sure it has a record stipulated in the Items property - otherwise it tends to show up as a blank form when you run the app.  You need to tell it to start at the first field or it gets lost in BFE. I tried many crazy suggestions for a couple of hours and this one finally worked and actually made sense. The Item's property for an Edit form is usually linked to a gallery selection somewhere else, but I'd need some more info to determine if this is the case for this app - for now set it to 

First(yourSourceName)

where yourSourceName is your SharePoint list connection - if that doesn't work I'll need some more info