I was working on my texture pack (It is unpacked). I pressed F3+T to reload the textures (As I was getting them to support 13w01a/b) and it went to a dirt screen and crashed. My Minecraft is not modded (as it is a snapshot and it is hard to find snapshot mods).
I am unsure if it affects 13w01a/b alone, but in 1.4.6 it did not crash upon pressing F3+T. Could it be because it's an HD (64x) texture pack?
I attached a crash report.
Edit: I should also mention that it is a folder one, not a zip.
Edit 2: THIS HAS BEEN FIXED!