Are you sure that the parent resources have their "Container" setting checked?
Worked like a charm, did not know that was a necessity, no reference of this in the rtfm nor the Kongondo guide...
I just stumbled over this myself a few days ago. Dragging resources in the Tree into another resource doesn't set the new parent's "Container" setting. Took me a while to figure out what was going on.
I have added a warning to the rtfm; bug report is
here
[ed. note: sottwell last edited this post 10 years, 9 months ago.]