I've been developing a wordpress website (with a custom theme) for a month. Today I wanted to upload an image to a page and I got a message saying there was an error and I should try again later.
I tried to upload the image directly to the library and I got the following error:
1096 Notice: ob_end_flush(): failed to delete buffer zlib output compression. in (...)/wp-includes/functions.php on line 2707
I deactivated all plugins, that didn't work. I tried changing the theme to twenty twelve, that didn't work. Is there anything I can do to fix this issue, or at least understand what this is all about?