I've tried searching for fixes for this and the only ones I found were many years old so hopefully there's an easier fix? Anyway, some of my worlds in the Sims 3 are completely red, but operable. Suns...
Just rename or move the Sims 3 folder to test to see if that fixes the problem.
The most usual cause of broken games is corrupted data. The data that gets corrupted is in the Sims 3 folder. All you are trying to do now is find out if you have a problem with corrupted data.
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