Today I got this, for unknown reasons

Ping Yahoo!

http://search.yahooapis.com/SiteExpl...temapindex.xml Update notification has successfully submitted.


I have already entered the fix published by a_berezin.
However, this Yahoo notification was previous to that, so unrelated.
Anyway, my files were never compressed, so the fix wouldn't affect the ping.
Actually, it is quite easy to understand the fix:
$pattern = '/^' . $this->filename . '.*(\.xml' . (SITEMAPXML_COMPRESS == 'true' ? '|\.xml\.gz' : '') . ')$/';
Basically this is saying: if sitemap files are compressed, then extension .gz.
Before it was the opposite.
I also have to note that I hard-coded the variable %s, I typed the whole URL there, only for Yahoo, in the Config for Sitemap XML.
That was not fixing it either, so I will test in the following days with the variable back.
Bottom line, I have no idea why this is/was happening, I posted to Yahoo dev forums to no avail.
Maybe the new authentication process solved it?
Maybe Yahoo changed something on their end?
Mystery...