I was very clear about creating a Navmesh for Cerebral Den, and looking at it in the construction set, I can see no problems, yet people are complaining about followers not navigating my house mod.

Can someone please tell me what is going on, so I can fix it?

I just answered this on SKYRE

NavMesh needs to be finalized inside and out before followers can use it, I'd check that first. If you're not sure how, check out this tutorial: http://tesalliance.org/forums/index.php?/topic/4668-ck-basics-lesson-4/ scroll down to Part III: Finalizing NavMeshes

You're right. I had done everything with the navmesh except finalize it. *sighs* Will do.