If you remember what week/day these errors are popping up, that would be helpful! Any specifics on when these bugs are happening can help me narrow them down. Are these bugs new to 2.0 or did you experience them in earlier playthroughs?
Hello! The initial stat glitch happened in about week 4 in my first playthrough, and in the second it somehow happened before the first meeting with the council. (I remember bc the council commented on it, and that's when I noticed the huge jump in Endurance points)
The black screen glitch was around chapter 9 I believe (when the MC ends up in the infirmary) and bc I spent so long trying to fix this one I know the next scene was supposed to be Arien mind blasting the boys bullying the MC. In Grey's route I never got to continue past the black screen, but I believe it was around week 7? I had definitely chosen him as the LI and had already done the hang out in the Autumn courtyard after the threatening note. These glitches are unique to this version, I played through Arien and Kai's route with no issues in the original. If I can help more, please let me know!