Using Beta 2, I used the method described in Do you have to use AGOL to use WAB? to make an app that used a basemap from Esri and accessed and edited (change the paths in the config_Edit.json) layers in an .sde from my ArcGIS Server. It did what I wanted and I was happy with it. Then Beta 3 was released. I haven't managed to get this to work in Beta 3. Could this be intentional on Esri's part? Has anyone else had the same results with Beta 3?