Recent Global Posts: Received HTTP error: "Not Found" while fetching source feed.

Hi there,

we installed the plug-in just as described in the install instructions.

However, the recent-global-posts-feed.php is accessible via browser, looks like a valid RSS feed, has CHMOD 775, but throws the following error, when added to Feedburner etc.:

Received HTTP error: "Not Found" while fetching source feed.

Feed Validator says:

Message

HTTP error with content that looks like a feed

Explanation

Your server is reporting a problem. However, the error message looks like it may be a feed. People will not be able to subscribe, but some browsers may mask the problem and show the feed contents.

Solution

View your feed's HTTP headers to diagnose the problem.

Header looks like this here (with a nice 404 message):

HTTP/1.1 404 Not Found =>
Date => Tue, 16 Apr 2013 17:29:27 GMT
Server => Apache
X-Powered-By => PHP/5.3.24
X-Pingback => http://website.com/xmlrpc.php
ETag => "cc0e5ec92a9ea3785eeb0f38616b9db3"
Expires => Wed, 11 Jan 1984 05:00:00 GMT
Cache-Control => no-cache, must-revalidate, max-age=0
Pragma => no-cache
Set-Cookie => wfvt_1160251293=516d8a7897795; expires=Tue, 16-Apr-2013 17:59:28 GMT; path=/
Connection => close
Content-Type => text/xml; charset=UTF-8

Did we miss something here?

Thank you in advance!

P.S: Couldn't find Recent Global Posts Feed in the "product" dropdown, therefore chose Post Indexer. Who might fix that, pls, fix it! Thx