Hiya
I'm trying to solve mine as well. Mine happens only in the game, otherwise its okay.
I get a 30 second lag, which is hell when we're in a match.
Just tried dropping some services, so will see what that's like today, as I have an interview in a bit so couldn't test it last night.
This actually sounds like you have the lag, not him. The reason I say this, is that I can say something, no reply. Can you hear me, no reply.
Then, 30 seconds later, they all get the wording.
So, do you have any antivirus/firewall programs running when you're using vent, and if so, which?
This is the last thing I'm going to try:
http://www.ventrilo.com/faq.php#sound7
But, I wouldn't advise it yet, as it may have problems elsewhere. I'll have a play with this if nothing else works.
btw, which game are you playing? I'm on Battlefield 2 and its a recent thing that's happened, as it was fine before.
Regards
eddie