Have you updated your site to 4.5.1 yet? It was a maintenance release that is supposed to fix this along with some other bugs. So far it has worked for me. I had the same issues with 4.5.
Yes, it automatically upgraded. Still having the problem, unfortunately.
Have you tried:
– deactivating all plugins to see if this resolves the problem. If this works, re-activate the plugins one by one until you find the problematic plugin(s).
– switching to the default theme to rule out any theme-specific problems.
– resetting the plugins folder by FTP or PhpMyAdmin. Sometimes, an apparently inactive plugin can still cause problems.
– re-uploading all files & folders – except the wp-content folder and wp-config.php & root .htaccess files – from a fresh download of WordPress. Make sure that you delete the old copies of files & folder before uploading the new ones.
I finally contacted my host – which is Bluehost – and they investigated from their end. Coincidentally, they had upgraded their php for my blog about 10 days ago – right around the time that WP 4.5 came out. When they went back to the previous version of php, everything worked. I checked it out again today and all the media downloaded like a dream. So, either the php isn’t working with this version of WP, or it’s conflicting with a plugin. Eventually, I’m going to have to be upgraded to the newest version, but for now, everything is working.
There is an extensive thread here with several workarounds to the uploading images problem: https://wordpress.org/support/topic/http-error-when-uploading-images-17/
I tried the htaccess method and it solved the problem for me.
1) Add this to your .htaccess file at the root of your WordPress installation just before the # BEGIN WordPress line:
SetEnv MAGICK_THREAD_LIMIT 1
OR
2) add this to your themes functions.php file (actually add to a child theme functions.php file or use a plugin like Code Snippets )
add_filter( 'wp_image_editors', 'change_graphic_lib' );
function change_graphic_lib($array) {
return array( 'WP_Image_Editor_GD', 'WP_Image_Editor_Imagick' );
}
Alternatively, you may install this plugin instead to change the default image editor:
default-to-gd
If neither of these works for you, try reading the thread mentioned at the top to see what others have done.
I hear that WP 4.5.2 may fix the problem.
