Just for completeness, it looks like someone else reported this about a month ago here: http://community.wd.com/t5/WD-My-Cloud/Can-t-copy-files-to-USB-connected-drive/td-p/618177
No solution there either.
Just for completeness, it looks like someone else reported this about a month ago here: http://community.wd.com/t5/WD-My-Cloud/Can-t-copy-files-to-USB-connected-drive/td-p/618177
No solution there either.