I'm currently working on updating the content on a friend's website. I've uploaded literally hundreds of images in the last few days without any issues but as of this evening, when I try to upload something WordPress tells me it can't create the directory and asks if its parent directory is writable by the server.
I have checked file permissions and the wp-content/uploads folder is currently set to 707, as are all of its subdirectories, which I understand ought to be writable. I temporarily changed the uploads folder to 777 anyway but it doesn't seem to have made any difference. wp-content is set to 755.
Perhaps more intriguingly, if I try to upload an image to an existing month (and thus an existing directory), I get the same error; however, the filenames are appearing in the folders when viewed in an FTP client, but are sized at 0 bytes and have the permissions 644 instead of 606 like the rest of the folder. I'm utterly bemused and not sure what to try next.
This is particularly odd since I haven't made any changes outside of the dashboard prior to the error occurring. The named upload directory in the media settings page is blank so I assume it defaults to wp-content/uploads as specified. Not sure what else to do. Can anyone help?