Adam,
I have a client who is on Mac OS 10.4.x in Firefox 3.0.5 and Safari. They have a problem with special characters. Those special characters are mdash (— ) and rsquo(’ ). On paste into the editor and submission of the record, the special characters become garbage. My client was able to recreate this problem on your demo page http://cutesoft.net/asp/EnableAll.asp

 I’m attaching a text document which contains text they had problem with, and if you need I can send you a video on what is happening. You probably will need to install Windows media player to view the video.
https://www2.gotomeeting.com/codec?Portal=www.gotomeeting.com

 

Text_They_have-Problem-with.txt