I have no idea what happened here... I could see the fish before, and now they show up as flashing red squares. I tried 'boolProp useShaders true' but that didn't solve anything. Any ideas? :\

Have you tried the game problem faq?

Turns out it was a car I downloaded eight months ago. I don't know what was conflicting with it (or what was happening) to make this happen buuut... problem solved?

Hey, could you please let me know what specific CC caused this?

My fish just started doing exactly this. In addition my tv and computer screens show a white background with a red "X" through them but can still otherwise be used.

Yeah turns out it wasn't the car. I was having BodyShop problems too (Sims showing up red in the bin) and so once I got rid of the car I thought it solved everything. Turns out no I have no idea what to do.

I fixed this issue by putting "optimized rendering" back on for just one run through. It fixed the graphics issues, but made things run super slowly (always did). The next time I ran the game I deselected the optimized rendering and it was back to normal gameplay speed but the graphics glitches remained solved. Good luck!