So I was trying to fix my game for me and another user's side on my desktop. After adding some mods (namely nraas mods), I began experiencing crashes at the loading screen before the main menu.

Link to my most recent script file: https://docs.google.com/document/d/1sHb ... sp=sharing

Even with the basic nointro and nobuildsparkles have caused crashes. I temporarily fixed it by uninstalling CCMagic and deleting the MODBUILD0 file in the packages folder. But when I redownloaded files from here and a few CAS items (clothes, shoes, etc), the crashes started again. I also think I may have messed up my Resource.cfg file. I'm at my wit's end.

What you have shared with us is a crash log, not a script log. Those are pretty useless, what it essentially says is that the game crashed. The one puzzling thing I see on it is that your game's script heap is very low (40 MB??) At some point did you attempt to deploy a "4 GB" fix to an .ini file in the game program folder? If so, you missed a few zeros and this should never be done anyway because the game is already designed, as of Patch 1.17, to use up to 4 GB of RAM all on its own when it needs to.

There are a few combinations of NRaas mods that will cause the game to crash on startup every time.

1 - Master Controller's MC Progression module without BOTH the MasterController and the StoryProgression base mods in play.
2 - A mod that designed to work with store content when that content is not present/loading, such as the Cupcake mod with the bakery set or the bakery displays not installed.
3 - The contents of Mods\Packages has changed, but the five cache files on the top level of the TS3 user game folder in Documents have not been cleared (deleted).

Not sure how there can be an issue with Resource.cfg unless you edited the file yourself or did not obtain an up to date one from a trusted source.
http://modthesims.info/wiki.php?title=G ... _and_Files

If none of the above fits your current situation, then I would suggest pulling out your entire TS3 user game folder from Documents to your Desktop for safekeeping so that a new one with no content spawns to take its place. You will have no added content at all, no installed worlds, mods, or game saves on this folder, but they will all be safe in the one that was pulled out. Can you get a new test game to startup properly on this one? How about if you add a freshly downloaded mod Framework back in with the two sample mods, and then a third test with that and a couple of NRaas mods like MC (base mod only) and Overwatch?

I wanted to try the 4 GB fix and even had the file open to edit it at one point, but then I saw another poster said it was just a myth, I think and closed out without editing anything.

Just realized that I forgot to DL SP when I was getting all of the mods. Removed Cupcake since I am trying to start with clean file and very few CC. And I just deleted the five cache files.

Edit: It works! I'm guessing it was SP since I forgot to DL them. I'm going to slowly re-add mods as I go.

Good to hear. If you ever wish to play without SP for any reason, either to test something or to try another form of progression, be sure to remove the MC Progression module as well. It cannot be present if SP is missing as we know that crashes the game, and it wouldn't have anything to do if MC and SP base mods are not both present. It's meant to act as a bridge between them.