OK - I have tried the few solutions I could find to this problem, with no luck. Using FeedWordPress, which had previosuly been working fine, suddenly I get this error when attempting to update the syndicated content:
update-feeds: instruct FeedWordPress to look for new syndicated content
Sending ping to <http://www.nicequietguy.com/xmlrpc.php>...
The XML-RPC ping failed (local): transport error - HTTP status code was not 200
I am beginning to suspect this is something I might have to contact my host admin for - perhpas some kind of change they made to something (all that is well beyond, so I have no idea what it would be). The main reason I suspect this is because I was able to put all the previous files back on the server, to replicate the exact same configuration, on my end, of the site when it was working. Could it have anything at all to do with the fact that we - meaning the people who use my host - share an IP address? Maybe that is a stupid question, I just don't know. Or could this be related to an Apache handler problem? Any ideas would be much appreciated - I took everything off of my server and was going to rebuild the site entirely, but have been stuck trying to get the syndicated content working again, and it is driving me crazy!