What Kevin said: indication of need to re-evaluate the hierarchy. The example file they give is like 25+ deep if a Dendron hierarchy. If the words were smaller than just

namespace

repeated, it could be like 40+ deep. At that point, I think something has maybe gone wonky with how something is being managed, hierarchy-wise. If anyone ever runs into it with Dendron, it would be interesting to see how and why. We have tags, for example, that can be used if needed, too.