Recently I was trying to export all of my wordpress blog images into cloudinary so that I could move them over to my ghost blog. When I would click "apply" it loads to a blank screen. Here's how I fixed it.
- First I went looking in the logs for anything that stood out
[Mon May 12 15:08:11 2014] [error] [client 126.96.36.199] PHP Notice: Undefined index: path in /srv/coreysnyderme/public/wp-content/themes/modernize/stylesheet/ie-style.php on line 17
[Mon May 12 15:08:11 2014] [error] [client 188.8.131.52] PHP Notice: Undefined index: path in /srv/coreysnyderme/public/wp-content/themes/modernize/stylesheet/ie-style.php on line 21
[Tue May 13 18:41:17 2014] [error] [client 184.108.40.206] PHP Fatal error: Call to undefined function curl_init() in /srv/coreysnyderme/public/wp-content/plugins/cloudinary-image-management-and-manipulation-in-the-cloud-cdn/uploader.php on line 108, referer: http://coreysnyder.me/wp-admin/upload.php
Notice the line about calling curl_init(). It turns out that curl is an extension that wasn't installed and needs to be.
sudo apt-get install php5-curl to install curl.
sudo service apache2 restart to restart apache.
Now go back into wordpress admin and try to export to cloudinary again. This time it should work!
If it doesn't try
sudo apt-get install curl libcurl3 libcurl3-dev; and restart apache again. You should be good to go!