Okay after further testing of the build issue, I've narrowed it down to 2 of my 40 or so goal txt files. This still makes absolutely no sense to me since they will build and play in game, yet somehow they are corrupting the mod after closing the editor.

Simply removing the two specific files (found through trial and error) allows me to build, save, close the editor, and open everything back up in working order.

Now to figure out what script in those files is making things break. It's only about 1400 lines of script..... suspicion