I have been experiencing a problem since the update before or after Lovestruck. The eyelashes that come with preset eyes are now lighter than they used to be. They should be black. Perhaps it's a transparency issue? I don't know, but it affects the Sim's appearance. The issue still persists today with no mods. Just look very closely at the eyelashes that come with preset eyes now vs how they used to be, and you can see that they are lighter. Try looking at them in different light sources.
Edit By Crinrict: Adjusted Title fit bug report at AHQ