I have a new install of UA.  I encountered the 403 error and came to the forums.
I replaced an existing, empty .htaccess file with one having the fix.  Still getting:
[2006/07/14 14:51:50] Uploading to Primary URL...: 
http://xxxxxxxx.com/roster/admin/update.php
[2006/07/14 14:51:50] CharacterProfiler.lua - No Compression. Upload Size: 0 KB
[2006/07/14 14:51:51] Upload Error: The remote server returned an error: (403) Forbidden.
[2006/07/14 14:51:51] Data Retrieval Error: The remote server returned an error: (403) Forbidden.
[2006/07/14 14:51:51] 
[2006/07/14 14:51:51] RetrData: url: 
http://xxxxxxxxx.com/uniadmin/interface.php 
[2006/07/14 14:51:51] RetrData: param1: OPERATION
[2006/07/14 14:51:51] RetrData: val1: GETDATA
[2006/07/14 14:51:51] RetrData: param2: username
[2006/07/14 14:51:51] RetrData: val2: uuuuuuuu
[2006/07/14 14:51:51] RetrData: param3: password
[2006/07/14 14:51:51] RetrData: val3: ppppppp
[2006/07/14 14:51:51] RetrData: Timeout: -1
[2006/07/14 14:51:51] RetrData: ------------------------------------------------------------------------
[2006/07/14 14:51:51] 
[2006/07/14 14:51:51] RetrData: ------------------------------------------------------------------------
[2006/07/14 14:51:51] 
There are additional htaccess files in my public_html  folder.  These have data:
htm.htaccess
html.htaccess
phtml.htaccess