CK crashes when saving Merged Plugins. Navmesh problem?

[Baron Of Hell]

On my last plugin merged I got the error "There were some Navmesh conflicts.  You'll need to rebuild these navmeshes in the CK". 

 

I look up how to fix this problem that ends with saving the merged plugin in CK.  The problem being that CK crashes  every time I try to save it. 

 

Problem might be that I am using instructions for LE but for the life of me I can't see how that would make a difference.  For now I'm just going to remove all the plugins that mess with navmeshes from the merge plugin  but I would really like to know how to go about fixing this. 

 

In this particular merge all plugins are followers. 

[Pfiffy]

I have this problem everytime I have hearthfire as master in the plugin list. DG or DB are no problem.