I have just had this exact same issue. I went to stream to my WDLive Plus, came in to set the language which was in Chinese, even though the main language was set to English (why not just have 1 language setting for the entire box?)
Came to my computer and i could not access any of the shares, i could ping the box, but not access it. had to do a hard reboot on it.
Once i was in and tried to set the language for DLNA, got the error message, 2 reboots later and i finally got the language set.
And now after rebooting the box, i have files and folders missing it seems.
I know this is a cheap box, but can companies not make products any more that "just work:....