I think we should all report this problem to beth until they get this fixed sounds like a pretty serious issue . you know how for some when you fire up the creation kit and get the error about the nav mesh and we are told that its fine and just hit yes to all and ignore it ? well its a lot more serious then that i found a video on youtube showing just how serious this bug is i have tried to post the link but it says i dont have the permission to , you can find it by just typing in youtube "the navmesh bug . It has i guess been around for around 6 years and STILL not fixed . Skyrim is by far my favorite game but this sounds like something that need to be fixed or at least know about by ALL the modding community so they can use the few fixes mentioned in the video to get around this bug .