Dreamweaver seems to not like the .css file you are using: _css/csd_style.css
Specifically it is choking on the style defined on line 15 where you update most tags to use position:relative.... for some reason that causes the Dreamweaver display to choke.
If you remove line 15 from that .css file it seems to correct the problem. I'm not sure why this is, it is something you could report to the Adobe Support team, but it isn't a file or style associated with a webassist product.