Let readers upload large files

[albertocv]

I have a Wordpress photography site and need to let users upload files larger than 10MB. I already increased upload_max_filesize in my php.ini to 30M.
I created a form using Fast Secure Contact Form and allowed files large up to 20M.
However, any time I try to upload a file bigger than 10MB, the form serves a blank page instead of the success notification.
What else can I do?

[SpacePhoenix]

Try setting the maximum execution time higher.

Check the errors from the $_FILES

[albertocv]

Thank you, I already set the maximum execution time to 480, do you think it is enough?
What do you mean with $_FILES?

[SpacePhoenix]

http://www.php.net/manual/en/feature...oad.errors.php

When you changed the maximum upload size, did you restart the server afterwards?

[albertocv]

http://www.php.net/manual/en/feature...oad.errors.php

When you changed the maximum upload size, did you restart the server afterwards?

My site is hosted on bluehost, I don't know how to restart the server. Anyways, I already increased the upload limit in the past and it didn't require a restart.
Thank you for the manual page but, where should I find the file array with the error codes?

[SpacePhoenix]

On the form for the uploading, what is the field called for the upload?

Is the new value for the memory limit showing ok in phpinfo() ?

[albertocv]

On the form for the uploading, what is the field called for the upload?

Is the new value for the memory limit showing ok in phpinfo() ?

The form uses an input field of type file. You can see it here: http://www.fotocomefare.com/rubrica-giorgio-trucco/

If I execute http://www.fotocomefare.com/info.php, all the settings are as I set them.