I'm sure my speakers work fine because i can hear other things on my computer such as videos. And I have no trouble seeing others but i cant hear them at all and the microphone sounds go up but I cant hear them :[
This sounds like a good reason to enter a Support Request to the ooVoo Customer Support folks.
http://support.oovoo.com/ics/support/default.asp?deptID=4244
Best Regards,ooVoo Dave