Premature End of Script Headers
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Solution: CGI/Perl Script missing the Context-Type variable. You should add it to your script. An example would be

:#!/usr/bin/perl
print “Content-type: text/plain\n\n”;
print “testing…\n”;

If this fails, your web host might be limiting the amount of processes you can run at the same time. If this is the case, only a support representative will be able to fix this by killing all the processes running on your account.

Invalid command ‘php_flag’, perhaps mis-spelled or defined by a module not included in the server configuration
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Solution: Your .htaccess file is trying to set php rules which isn’t allowed. You’ll have to move those rules to a new php.ini file (should be placed on /public_html). An example would with register_globals would be:

On .htaccess:
php_value register_globals on

On php.ini:
register_globals=On

So basically just delete the php_flag on your .htaccess file and move it to a php.ini which should be placed on the same directory your .htaccess file is.

Directory is writeable by others /home/username/public_html/folder

Solution: This generally means that your folder/file permissions are incorrect (it also means that your server is using phpsuexec/cgi api).The typical permissions for a php file are “644″ and for a folder they are “755″.