Fixing terrain causes my game to blank out

Product: The Sims 4
Platform:PC
Which language are you playing the game in? English
How often does the bug occur? Every time (100%)
What is your current game version number? latest update, cant remeber version
What expansions, game packs, and stuff packs do you have installed? all
Steps: How can we find the bug ourselves? delete mods?
What happens when the bug occurs? fixing terrain, flatting the lot out
What do you expect to see? fixing terrain the all of a sudden games blanks out
Have you installed any customization with the game, e.g. Custom Content or Mods? Yes
Did this issue appear after a specific patch or change you made to your system? Yes
Please describe the patch or change you made. updated my game

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everytime i load onto this lot, heavy cc. I try to flatten the terrain then my game blanks back to my home screen.