On a Windows 7 development machine, I have expression web 3, PHP 5 installed I have been using expression web and PHP for a while, and previewing php pages etc on pressing F12 (preview using local server). Suddenly on F12 all PHP pages display as blank, even a phpinfo() file. Standard html pages continue to work correctly on F12. If I place the same page php inside the default website on inetpub and browse using localhost then the phpinfo() file works. So I know that php is installed and configured correctly for IIS. Things I've checked: Gone into site settings in Expression web and confirmed that php is selected and it is pointing to the php executable Reinstalled php Checked iis that the php extension is registered. Copied files to a different machine with expression web and php installed and it works on. The strange thing is that it gives a blank (no errors) page inside expression web, but does work inside inetpub This was working up until recently, then suddenly stopped for no reason.