Mojang Logo Cannot be Changed with a Resource Pack

Alright, so I created a resource pack when 13w47e was out. I was changing some textures, and then I changed the Mojang startup logo to purple. I tested the texture changes, and they all worked. Then, when 13w48a came out, the startup logo was set to default, even after numerous attempts with the resource pack enabled.

What I expected to happen was:
The customized Mojang logo to appear.

What actually happened was:
The default logo appeared.

Steps to Reproduce:
1. Make a change to the default logo.
2. Save it into your resource pack's folder that you will be using.
3. Start up Minecraft on 13w48a with your custom pack enabled.