I am running into a similar issue. I created the data source and transform maps etc. I can run the datasource manually and it does get the data; however, it just sits there and stares back at me 😞 - meaning it does not run nor do the transform map field gets updated. It worked the day before. Any help is appreciated. 

Source table has the ,transform map, target,target record and import set run  fields (empty); but the data, from SCCM is there.

I noticed the default SCCM tables all have those fields populated.