So, playing through act 2 normal on my Demon Hunter, the point in the game where you are fighting with the enchantress, when I got to the part where she reveals who she is and says she wants to join you, I elected to keep my templar and send the enchantress back to camp. When I did, she vanished, the bridge opened up, and i proceeded across. However, on the other side, she flickered into view again for a few seconds, before vanishing for good.
Pretty minor, but I am at work and bored so I thought I would throw it up.
Windows 7 machine with a Geforce GTX 550.