mod_php4 to phpsuexec without problems

Hello,

In php4+php5 thread (http://forums.cpanel.net/showthread.php?t=45908&highlight=php4+php5) , the author says: If you want to update mod_ph4 to phpSuEXEC, read threads in this forum, or you will get many many scripts don´t working.

I have search but not found anything about this. Please, help.

Thank you vm.