The Sims 4’s latest update has redesigned the way The Gallery looks and functions. Because of it heavily scripted mods (such as the UI Extension Mod) can affect your gameplay experience or even lead to UI errors and game crashes.
One of the things that many have reported is an issue where friends, followers and downloads on your personal profile would go “000000” and sometimes even your screen would go black after browsing through the gallery. It has been confirmed that this issue is caused by Mods (specifically UI Extension Mod) but it can be solved.
Removing the mods from your Mods folder and / or updating them to the latest verseion doesn’t always do the trick though. To fully fix The Gallery UI issues go to Electronic Arts > The Sims 4 save game folder and delete a cache file called “localthumbcache.package”. This is a cache file which regenerates after opening up The Sims 4 again so you don’t have to worry if it’s going to affect your game or not.