About black screen - no, I've never come across anything like this. Perhaps you have a corrupted archive with the game, try to download the game again and unpack it in the same place where you have it unpacked now, having previously deleted and copied to another directory/local disk the version you have (saves will not suffer from this). Another (extremely unlikely) variant is that you got a censored version of the game.
I've loaded your save, result is on the screenshot.
View attachment 3418476
About logic. I agree about Stella, but turning off father's support? I think the changes required to make the work pay better would require too much work from the game developers at this point, slowing down further development. Well, with the current pay system it will only lead to excessive (and completely unnecessary) grind, which can bury the game's story underneath. Our protagonist will still need money, and it's a decent amount. This means MC will be forced to work many weeks in a cafe or nightclub, for anything else he will not have enough energy or time. Advancement on all quests (and the main plot) will be slowed down in the most radical way. And most importantly - it's an endless boring cycle: home-school-work-home and so on ad infinitum. It's just not interesting to play. After all, it's just a game, not a life simulator - that's what Sims 4 is for.