Uploading - skipping files across platforms and versionnumbers

I'm using Dreamweaver CS3 on XP.

I've had a problem with Dreamweaver's FTP feature for several months now. I
will try to upload a file, and only about 1/4 of the time, will it upload
successfully.

I will sometimes get a message saying: "Some files were skipped during the
last operation. A list of these files has been logged in the FTP log window".
Then, that file, (index.html, for instance) will be deleted from the server.
Often, it takes 7-10 tries to just upload one file.

other times, I'll get this error message instead "There was no response from
the server while transferring the file "index.html" 2 attempts made" It
doesn't matter whether i click "Try Again" or hit "Cancel" and try it again
manually... still, only about 1/4 of the time it's successful.

In the FTP log, this is what it says, for instance: (This is just 1
example... it's happening across all 45 sites i manage)
=======================================
< 230 user logged in

PWD
257 "/ksmk.org" is current directory
PWD
257 "/ksmk.org" is current directory

The file "/ksmk.org/index.html" was skipped because the old remote file could
not be deleted.
=========================================

Fixes I've tried: re-setting my firewall to allow dreamweaver access. using
passive FTP. using ipv6 transfer mode. the only thing that seemed to work
was deleting the setting of "Home Page" under the "Site Map Layout" tab in
Advanced Settings. it would work flawlessly up to 2 or 3 times. But then,
that setting would automatically be populated again, and i'm back to square
one. I'm not going to go into the settings every time i want to upload
something!

I gave up, and started using WS FTP instead. a pain, because i really like
Dreamweaver's FTP better, but WS FTP is better than the frustration. i figured
i was just doing something stupid.

But now, my brother in Texas, on Vista and CS4 is having the same exact
problems. and, my friend 20 miles away on XP with CS3 is as well. so it's not
just my problem. It's happening across ISP's, platforms, servers... every
variable except Mac. I've been fine using dreamweaver on Macs... possibly
just a PC issue?

any ideas and suggestions would be gladly appreciated.

thanks

-Andrew Latham.