Not just o MAC
It seem its a bug on Windows XP too. I'm running Dreamweaver CS6 on Windows XP. I did not try it on my Windows 7 computer yet.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.