Hello everybody, I was having some serious NavMesh problems with my mod, which could only be solved by converting to a master (esm) file. Unfortunately, the conversion has left me with a new problem. I've never worked with master files before, and therefore am not sure what are their limitations. My mod adds a number of new interior cells to the gameworld. However, it also modifies several existing cells, both interiors and exteriors. The changes made are quite minor - objects are moved around, some are deleted; some NavMesh fixes; a little landscape painting etc. - you get the point. Trouble is, the game completely ignores any changes made to existing content - only newly added content is actually applied. I deduced that a master cannot override another master - this option is restricted to plugin files alone. Is this accurate? Though yet to attempt it, I figure I could use both a master and a plugin - the former for adding new content, the later to override existing content. However, I would, if possible, prefer using only one of the two. This is where I could use your help: 1. Is there any way to eliminate the NavMesh problems, without using a master? 2. Can a master be made to override another master? I would be much obliged for any input, jazzisparis