Situation 1) Yes, it's a problem others have faced before. There are a few fixes. The one I'd recommend is using New Vegas Stutter Remover. Install that, launch the game once, quit. Then go to the NVAC installation folder (Data/NVSE/plugins). There, you'll find a file called sr_New_Vegas_Stutter_Remover.ini. Open it up, and look for bFastExit line; it will be like the 7th or 8th line. It should be marked "bFastExit = 1" by default, but if the value is 0, change it to 1. This should fix any crash on exit issues you have. Situation 2) Would need to look at your load order to confirm what mods (if any) are causing your game to go kaput. The save thing sounds painful. But then, default save system is pretty buggy. Switch to using CASM. Next, I'd suggest learning how to use FNVEdit. it is actually pretty easy to use, and well worth the 30 minute investment you have to make to figure out how to detect errors, make patches to fix issues, etc.