These threads were posted in the last 2 days about the same issue (use the search!):
http://devforum.roblox.com/t/new-sounds-messed-up/27419
More information on sound updates to be found on this thread:
Here is the relevant staff reply regarding your issue
TLDR; Don’t play the sound and then immediately destroy it afterwards. Instead, set Sound::PlayOnRemove to true, then destroy the sound.
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