one thing I always try is a totaly separate FTP client. The DW module does have a reputation for being a bit iffy. I'd try a freebie one like cute ftp just to eliminate that issue
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.