Help.Cant copy to or delete files from , but there is a Twist..!!!

Here is a problem for someone to puzzle over, my Mycloud has recently stopped me from copying files to it, or deleting files from it, this is using the desktop and the web based app, (I will just get an error message in the finder), I CAN copy files from it back onto my Mac. But here is the twist, I use the Mycloud for my time machine backup which still seems to be working perfectly.
I’ve checked permissions, they’ve not changed, ive done the restart thing via online app. basically turned it off and on again, tried an older version of the software but it still refuses to play ball.
Any Suggestions Welcome.

Hello,

Please refer to the following KBA article: http://support-en.wd.com/app/answers/detail/a_id/21182/

which article?, there are lots to choose from!