When I place carts on tracks they do not render and they show up white. Also in the creative tab the textures for certain items show up as either grey or invisible. I do use Optifine and if there is a setting that I missed please let me know.

Edit:Is there a way to disable Halloween event?

Hey, thanks for the report.

1. It's the Halloween Event.
2. Don't use Optifine or go bug them to fix their custom texture loader support (again).