Gallery doesn't work after latest update

After downloading the 1.46.18.1020 update, the gallery keeps freezing when I try to place a lot or when I try to merge a household in CAS. The same thing happens when I try to save a lot that I just built. The screen becomes blue-ish and the game doesn't respond anymore, I have to close it every time. Can somebody help me, please?

Apparently you are using 2 different Sims 4 versions:
1 via Origin so you can get to the Gallery
1 via our latest update where you can't get to the Gallery.

The game via Origin should only be used for Gallery downloads. Never save such a game.
Play the game with the G4TW DLC's and updates as items from the Gallery will be available here as well.
Don't forget to close Origin before you start a G4TW game.