Can't update upload_max_filesize

I have tried three different ways to update upload_max_filesize on my Multisite setup, but it doesn’t seem to be working out. As you can see on my phpinfo(), upload_max_filesize is properly set at 25MB as I did, but I’m still getting a 1MB max. filesize on both browser and WordPress uploaders.

Here’s what I’ve added to my .htaccess (had to remove, as it was causing 500 erros):

php_value memory_limit = 99M
php_value max_execution_time = 300
php_value upload_max_filesize = 25M
php_value post_max_size = 24M

And here’s what I added to the end of my php.ini.

memory_limit = 99M
max_execution_time = 300
upload_max_filesize = 25M
post_max_size = 24M

And at last, on my theme’s functions.php:

@ini_set( 'upload_max_size' , '25M' );
@ini_set( 'post_max_size', '24M');
@ini_set( 'max_execution_time', '300' );

Any ideas? Please note that upload_max_filesize seems to be just fine on my phpinfo(). I already got in touch with the guys at Media Temple, but everything seems to be just fine on their side.