I ran "php -i" for both lsapi and fastcgi versions.
That confirms that both are using the exact same ini file (/opt/csw/etc/php.ini)
Yet they are behaving differently. That's just a fact -- you can tell me that they should not be, but that's not what I'm seeing.
When there is an error, lsphp will print it with the page (as it should). However in the particular case I'm telling you about, it did not.
I've also seen other examples where the php error was logged, so it's worked before.