I love Apple's Text-to-Speech feature. Use it all the time to have my emails proofread back to me, but I've recently started having issues with it though. I think the problems started when I upgraded to Lion, but I'm not 100% sure. What I am sure of is that its only a problem when I have my Apple LED Cinema Display monitor plugged in. Of the three cables I use to attach my monitor (power, Mini DisplayPort, USB) its only a problem when the USB cable is connected, if that helps. Any ideas?