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Only one participant needs a Skype Premium account for group video calls.
The most common cause is that your system does not meet the minimum requirements of the latest version of Skype.
If your Mac doesn't meet the minimum requirements or you're still having trouble, we suggest you download Skype 2.8 for Mac OS X.
Another common issue is with the default text-to-speech setting on Mac OS X. To change the default text-to-speech setting: