I just finished installing Map Viewer Beta for Portal use. I have a layer that when I turn on labels for it, it will not draw and constantly appears to be loading. Labels work fine on my other layers just not this one. Data is referenced data, not hosted. Also, the underlying feature class is created via a Python script by joining data from other tables. I tried publishing the web layer with and without labels. When I publish it with labels, I have the same behavior as when I enable labels with map viewer beta.