Is there a way to fix black screen after loading? I tried to use that DNA ini generator and none of my saves were working. Now even though I erased local content and installed the game again, it CTD right after loading.
Also, in the future, always make copies of .ini files before making changes so you have safe versions to go back to; there shouldn't be a need to reinstall the game because of ini changes. Especially when using the .ini creator, it's better to try and figure out the specific line in the output than copy and paste the whole thing.
As to why your save files broke, it seems like you changed the uGrids settings; if the saves are still around, you basically need to match the game's uGrids settings to the ones you had when you made the saves, if they don't load after your reinstallation. You can then create a save with a desired uGrids from the console and use that going forward. See the OP for more info - a whole section on it near the bottom.