Netflix "Watch Instantly" Problem

I’m having a problem with Netflix’s “Watch Instantly” feature. When I watch 30 Rock the sound is all messed up. It sounds like there are two audio tracks playing at the same time. I only have this problem when I watch 30 Rock. Everything else has sound that isn’t messed up. I’m using Camino for a browser but the same thing happens in Safari.

I’m on a MacBook with 1 GB of ram and a 2.1 GHz Intel Core 2 Duo processor running OS X 10.5.6. All my software is up to date and I installed the most recent Silverlight plugin.

Any ideas?

Thanks in advance.