Can't hear people but they can hear me

[Enfirok]

This is actually what's going on with my friend. she's using a mac laptop that she hasn't really used much, and i'm on a pc. i had just finished talking on another ventrilo server and hopped over to hers, and while i can hear her perfectly, she can't hear me at all. of course i made sure my mic wasn't muted and she made sure that she didn't have vent muted. codec showed as the right one for me and her both. open to any ideas. on a side note, no other voice program seems to be working right for her either.