Fucking weird Ventrilo problem

Thanatos

So, when I use Ventrilo, there's one particular person who, when she speaks, starts off sounding fine, but then within a second the voice degrades into static and mumbles. I'm the only one hearing this; everyone else in the room hears her just fine, no problems. I can hear everyone else in the room just fine, no problems. I have no modifications on for this person. I've tried re-installing the latest version of Ventrilo, and it keeps doing it. What the fuck?