Thanks Tinwarble,
I did update the firmware on My Net N900 Central when it got posted on WD website,. I updated to see if fixes the SMB problems and other issues that I reported here
But I am afraid it is not yet resolved. (No surprises here) Things like these takes time to resolve.
Having said, I am working with WD Customer support on these matters. I will keep community updated when I get these issues addressed.
Thanks
Vistawall.