Can't upload "put" files to remote server unless they are in a folder. Please help.

Question

I have done many searches on this and found no solutions. Here is the problem:
When I upload a file from my local site to the remote server it works fine as long as that file is contained in a folder.
Example:
I can upload an image from my images folder, or a template page from my template folder with no problem.
BUT, I can not upload any web/html pages, my CSS page, site map, or any file for that matter that is simply in the root directory but not in it's own folder.
When I try to do that I get this error:
index.html - error occurred - An FTP error occurred - cannot put index.html.  Access denied.  The file may not exist, or there could be a permission problem.   Make sure you have proper authorization on the server and the server is properly configured.
File activity incomplete. 1 file(s) or folder(s) were not completed.
Files with errors: 1
index.html
So every time I make a change to my index page I can't upload it to the server without getting that error unless I use a 2nd party program like Filezilla - which works fine. It is only Dreamweaver doing this.
I have been using dreamweaver for a long time and had no problems with this site. This all started happening out of no where. and it is happening on my work and home computer.
I made no changes to my server preferances or anythijng like that.
I was just doing my thing - being happy - and then BAM, not happy any more....

Answer 1

Hi there. First off thank you for your interest and your help.
I have done what you suggest probably 30 times as I have obsessed over this crazy problem for a couple straight weeks before I finaly gave up on CS5.5
I'm not sure what you mean by REMOTE server. The only server settings I am aware of are the ones in Dreamweaver. Here they are:
5.0 Settings:
Server Name = the same values on each
Connect Using = FTP
FTP Address = same numeric value on 5.0 & 5.5 port 21
User name = same on both
Password = same on both
Root directory = is blank (I have tried it using / with no luck as well)
web URL = http://ftp.westbrookadvertising.com/www/htdocs/
Passive FTP is checked & Use FTP Peformance optimization is checked.
5.5 Settings:
Server Name = the same values on each
Connect Using = FTP
FTP Address = same numeric value on 5.0 & 5.5 port 21
User name = same on both
Password = same on both
Root directory = is blank (I have tried it using / with no luck as well)
web URL = http://ftp.westbrookadvertising.com/www/htdocs/
Passive FTP is checked & Use FTP Peformance optimization is checked.