150+ mods is quite a lot; ever tried to reduce your load order to ~100 active mods? It sounds like you hit your personal mod limit - if your load order hits a certain number, things start to get funky. Crashes, objects vanishing, main menu not appearing,... I really recommend you to: 1) look at a mod compilation, like Mission Mojave - Ultimate Edition. As far as Ive read, loads of your mods are rather small fixes which may be/are incorporated in MMUE. Bonus points: everything is optimized to work properly which each other. 2) make a bashed patch with Wrye Flash. DONT use the merged patch from FNVEdit - this tool is too old any might screw you over. I see you know how to use BOSS; get the bashed tags from it, mark the mods accordingly in Wrye Flash and let it create a bashed patch. Usually there is no harm in doing so, it WILL reduce your load order significatly and it makes sure that important edits are rally loaded into the game.