Thread:Project:Support desk/Blank page after install/reply (9)

If you have a blank page 500 error, It is rather unlikely to be caused by the ctype issue. Instead look at manual:How to debug and try to find the actual php error. (If you actually have an error message  then yes you'd have to re-compile php. See http://ca.php.net/manual/en/ctype.setup.php . Note however, ctype_digit is included in the default compilation options, so you'd have to explicitly disable it for it not to be included.)