Try moving the Sim out and back in via manage world.
Are you just using hair/clothing/object custom content or also mods ?
Also deleting cache files might also help: http://sims4.crinrict.com/en/2014/09/delete-cache-files/
We are having this same issue. I just came back into playing Sims, and felt like something was missing. I just now realized I haven't been able to see the whims at all since coming back. I've cleared the cache once, have restarted multiple times. The only way I noticed was that I got an achievement for completing 100 whims. They just don't appear at all in the game visually.
They changed this as it's now an option.
Go to your game options and turn them back on.
I'm locking this thread as it's old.
Please use this thread if you have further questions: https://answers.ea.com/t5/Technical-Issues-PC/Sims-4-no-whims-showing-up-after-november-2018-patch/m-p/7166990
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