I use dreamweaver 4.
First you need to edit the ftp extension file and state that php,tpl, ect is a ascii file.
2nd is you need to be careful how you use urls.
Because dreamweaver will try to change to url from the local file structure to the site file structure when using the internal ftp.
Sometimes I will use dreamweaver to edit. But I use filezilla to upload the forum files.
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Blue Man Group