Can't upload large attachment

Hi. I'm using 1.1.4.

I can't upload large attachments. I've put a php.ini file at the root on my server containing:

memory_limit = 100M
upload_max_filesize = 100M
post_max_size = 100M
max_allowed_packet=100M

I also tried adding this to my htaccess file:

php_value upload_max_filesize 100M
php_value post_max_size 100M

I've also changed the max file size in advanced settings to 64M.

Any ideas? Thanks in advance.

Kevin