Marcromedia does a good job of describing how to map those directories in the section "Check the URL Prefix in the Site Definition" at http://www.macromedia.com/cfusion/knowledg...cfm?id=tn_16515.
The URL prefix refers to the Testing Server, not the remote server. It may depend on how you defined your (Local Server/Testing Server/Remote Server) setup when you installed Dreamweaver. Since, I chose to have all 3 servers, Dreamweaver tries to execute the comments-view.php page from the tutorial at my Testing Server, which is Apache installed on the same PC as Dreamweaver. Anyway, that link is a good read that refers to your previous discussion.
My interest is that I'm still getting the exact same error that you described. Google shows about 7 postings with this same problem, but no solutions. Only 7 postings, means that this problem is amazingly rare, or everyone else solved it so easily that they didn't bother to post about it.
I"m still looking for the answer. Some hints that I have evolved are:
1) When I display comments-view.php in a browser, I see a blank white page.
2) When I use the browser to view the source code, all it displays are two lonely body tags.
3) When I use Windows Notebook to open that exact same page on my hard drive, all the code is there.
4) Dreamweaver designs it's PHP to execute first, before the HTML. In Windows Notebook, I can see all the PHP code at the very top of the page before the other code.
5) Maybe ==> It is a parsing error, i.e. an error in the code that Dreamweaver put on the page. Since, PHP executes first and hangs up, the rest of the page is not displayed even though it is there.
Hey, I'm still guessing and looking. Good luck. Please post if you figure anything out.