Please read the first post carefully and post in the thread that reflects your issue best. Go in order from top to bottom if you see multiple of the symptoms. The top ones are more specialized as t...
Ideas
For people with 800/801 bug:
Try delete lot by Sims4Studio. Only if this lot is empty - without sims!
It's help for me (on tested save from willfa13 ) and I hope it will helps your game!
Quick tutorial:
https://docs.google.com/document/d/1w0NmeEk7_zpoVLkIZ0NadtkMbWD3SbFr8OxyBnwZZzA/edit?usp=sharing
Unfortunately the bug will still be there. The corrupted core coding will render that lot useless. Willow Creek is usually the first World to get corrupted.