I see, but that's so weird...
Why won't the add-on work without the patch and mods? I'm 100% using System Locale too.
I notice that when I use a save with only the OG personalities, it loads just fine. It's just the new personalities that cause this problem.
Just a random thought, you tried launching the game via the locale emulator?
I remember the original version at launch (before patches and translation) caused me and other people here to get an infinite white screen at first, but it ended up working fine when launched in the emulator. My locale were already in JP, but somehow it still needed the emulator. Maybe the untranslated bits in the new content are causing this mess, or something like that?
I haven't downloaded the update yet and can't really get on that today so I can't try it myself, but it's worth a shot if you already have the updated game.
It's easy said than done unfortunally; I have the version with the better repack 1 integrated, uncensor and english translation with MTL. I only found one page that made me download the game in the version 1.0.2, if you have a better link to share it will be much appreciated.
The version I have is the preinstalled STN Better Repack from the
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, then I just applied the latest HF patch for a few QoL additions, you can find the link for it in the last few pages of this thread. So not much tempering/installing to do. Download torrent, check that game works, download and apply HF patch, and done.
That said, this version is now outdated since the game got updated with new characters, so you might be better off waiting for an updated Repack, unless you really want to play right now.