It sounds like some sound files are missing? I don't want to be lame but have you tried the Blizzard Repair Tool?
Straight from the Blizzard Support site:
When should I use the repair tool?
Game crashes due to data reported as missing or corrupted. In-game graphical or sound issues due to missing data. Updater reports it cannot patch because the source data does not match.
Where is the repair tool, and how do I use it?
In your StarCraft II Installation folder, there is a folder labeled "Support". Inside this folder is a file called "Repair.exe" for PC or "Repair.app" for Mac. To perform a repair, simply run this file.
Doing so will prompt you with a dialogue, asking you if you want to repair. Clicking "Repair" will begin the process. Note that this process may take an extended amount of time - this is normal.
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