I also have encountered this bug. Drivers, windows updates, cache verification, and various setting changes did not help me.
However, I have found that completely turning off my PC and booting up will rid the pink textures from my game.
If I restart instead of completely shutting down this does not work. If I close PE and run it a 2nd time the pink textures return.
I am running PE from an internal SSD on a laptop with a 780M GeForce card with the latest public driver, 347.88. I use windows 8.1. I run the game on a 2nd monitor. I also play PE with the IEmod installed but my testing shows that isn't affecting this.