Hi, I don't know at which point in the game you are but I tried my last two saves provided in the game and everything works fine. (in the PC version)
I'm also playing the PC version.
This happened to me once. I think I went to Bridget's home to look after Frank at Night or at Late Night time and then had sex with her. I lost about two hours of gameplay. So I never did that again.
I'd suggest to try Late Evening, Night, & Late Night to see at what point this happens.
Also, I would suggest to make sure that when the MC investigates both Frank or Bob but doesn't have sex with the ladies only one time slot passes and not two or three.
Additionally, I'm actually at the Kelly Conference Hotel scene in the evening and the graphics of the animations are very poor. Is this supposed to be that way? The former animations except for the Ivy/Denise scenes had a much better quality.
I'd also suggest to take your time to sync the beginning and the end of the animations so that they look like they are in one flow when the game repeats them. It doesn't matter how long the animations are (exactly 1, 2 or 3 seconds for example), just that they are in sync.
It seems that you set the trigger for David to go to the hospital based on Katrin's Love or Lust points. That causes David to go to the hospital way earlier than it should be the case (after the MC talks with David about the cure). Maybe you should set a separate trigger there.
There's also a hint missing for when you should call Ester and invite her to go to the cinema. Maybe you should add it.
That's it so far from my side.
If you sync the animations and keep their quality constant and fix the stuff I mentioned the quality of the game should raise by a lot. Maybe some additional text tweaks for the ladies working in the mall or when you meet them at Ivy's home would be nice so that they don't all always say the same.
After that you could even try to contact Stream and sell your game on their platform. That should allow you to make some extra bucks.
Edit:
It doesn't make sense that after Naomi broke up with Bob she still mentions in her room that she is engaged to Bob (end of 0.5.0). Maybe you should change that.
The hint for setting up everything for Katrin dinner still remains in the hint list after finishing the dinner date. It should've been deleted right after.