For some reason, when choosing a different version of Minecraft than the latest, I don't get any sound at all. Anyone else having this problem? I have tested this on 1.6.2 and 1.6.4, as they are the earliest versions I have.

To replicate: 1. Choose any non 1.7.4 version
Step 2: Hit Play Offline
Step 3: Note how you don't have any sound even though the music and sound options are all the way up and your system volume is up.