HTTP error when uploading an image via the WordPress Media Uploader

Question

Each time I try to upload an image using the WordPress Media Uploader (WP Admin > Media > Add new) the upload stalls at around 13% and I get an error message appear on screen "HTTP error".

So far I have created a php.ini file in my WordPress root with the following:

memory_limit = 256M
upload_max_filesize = 16M
post_max_size = 64M

I've also put a php.ini file in my /wp-admin/ folder (an exact duplicate of the above).

After checking with phpinfo() I can see these changes have taken effect but they have not resolved the 'HTTP error' problem I am getting.

I am using a 1and1.co.uk dedicated server (managed) so don't have root access. 1and1 have confirmed plain CGI is enabled on the server (not Fast CGI if that makes much difference?).

Why might this error be happening? Is there anything else I can do to try to resolve it?

UPDATE: I have done some testing using different browsers and different devices:

Acer Aspire One netbook

• Chrome - problem exists
• FireFox - problem exists
• IE - working
• Safari - problem exists

Acer Aspire 5552 laptop

• Chrome - working
• FireFox - working
• IE - working
• Safari - working

Google Nexus 7 tablet

• Chrome - working
• FireFox - working
• IE - working
• Safari - working

Samsung Galaxy G4 Mini

• Chrome - working
• FireFox - working
• IE - working
• Safari - working

As you can see the problem only exists in Chrome, FF and Safari on my Acer Aspire One netbook. What could be the source of this problem?

Answer 1

I put the following code into my functions.php file. It works!

add_filter( 'wp_image_editors', 'change_graphic_lib' );
function change_graphic_lib($array) {
return array( 'WP_Image_Editor_GD', 'WP_Image_Editor_Imagick' );
}