Those of you on BlueHost may or may not have seen an option in your CPanel page to “change” the PHP configuration. I highly recommend not using it to try to change your PHP version. I’m still on a PHP4 server, and I found that using the PHP5 engine does not send out pingbacks.
My server kicked us up to PHP 5.05 a few days ago and I have annoying issues too. At least you got to choose to upgrade(?) or not…
5.05? That’s an older version of PHP5, if I’m not mistaken. BlueHost’s PHP5 server is at least 5.1.6 (the reason I say “at least” is the page that told me that also says the PHP4 version is 4.4.6, and that’s out of date).