So, my conclusions are that, something is changing on steam's side to be a major pain in the butt once I've launched the game, and whatever it is, it's stopping the 4GB Launcher from getting very far afterwards. Wat. The thing is, I've checked in on the 4GB Launcher's log, and it only has stuff from when I forgot to put in the correct arguments from Fear and Loathing.
But going off something I saw somewhere earlier, in a more general steam topic on the App Load Error, I flushed steam's cache, and the game loads! Once.
I've googled damn hard on this subject, and I've tried Post 8 of this.