I had a case not to long ago where somebody had an issue with getting the xml file to stick. They had to try about 5 times before it worked, not sure why.
Go to Window -> Workspace Layouts -> Reset '<layout name>'
Close Dreamweaver, then delete the Dreamweaver cache from the users configuration folder:
Then copy the xml file from the known issues pack again.
If it still doesn't fix the issue:
in the WA_UniversalEmail/mail_PHP.php file, find the following line:
$lineEnd = "\r\n";
and change it to:
$lineEnd = "\n";