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[eluser]slapo[/eluser]
[quote author="xwero" date="1235064338"]Don't load the database class and see if you get output then. Database misconfiguration is known to show a blank page.[/quote]

Thanks xwero,

that was it, for some reason PHP stopped loading the mssql.dll extension in both FastCGI, then in ISAPI mode, but as I put FastCGI back, I'm back in business. Why that has happened, I have no idea... I guess I'll just have to write a CI driver for the sqlsrv PHP driver, just in case the php_mssql.dll loses it again

Thanks again, both of you.