I try to change the header via the custom header link in appearance, i'm able to get as far as the crop and publish page but when I click ok (i've tried both options 'use image as is and publish' and 'crop and publish') it doesn't load, all I get is a white page. Also on occasion I get a html error when I try to upload an image via the media uploader.
everything was working fine until I updated to the latest wordpress a couple of days ago.
I have checked my media settings, changed the permissions, reinstalled and rolled back wordpress, deactivating and uninstalling all plugins, I've tried uploading the image directly to cpanel but no luck.
Here is a link to what I am getting--> imgur.com/lSJlUO0