Problems after FW upgrade: WDMYCLOUD

By the way, i disconnected my 1TB usb expansion drive and plugged it into my desktop pc. And i plugged a 16GB usb flash drive onto the mycloud device. I left everything like that for a whole day. I noticed that everything was stable and that the 16gb usb flash drive stayed mounted on the mycloud device as with the 1TB usb expansion  drive on my desktop pc. Could  it be that the new fw is not compatible to hi capacity usb drives?

Can anybody walk me thru the details about the twonky. I tried following these instructions: 

http://community.wd.com/t5/WD-My-Cloud/twonky-server/m-p/770861#M18682

But can’t quite follow it. Thanks in advance.