4.1.7 Slow To Respond To SMB Network Discovery...

I think I have the same problem - after upgrading my nv+ to 4.1.7, my macintosh clients (using cifs/smb) see the server and allow me to browse to the top couple of directories on it, but as soon as I try to list a directory that has a lot of files (several hundred) or perform actions that access multiple files, the mac times out and kills the smb connection. Here's what I see in the system log file on the mac:

Dec 3 08:16:50 myhostname KernelEventAgent[36]: tid 00000000 type 'smbfs', mounted on '/Volumes/mysharename', from '//GUEST:@myreadynasname%20(CIFS)._smb._tcp.local/mysharename', dead

[mysharename, myhostname and myreadynasname are not the real names of course]

When I try to re-install 4.1.7 by using using "check for update, I get an error saying "error connecting to remote server".
I am ok reverting to 4.1.6, but can't find a .bin file for it. The 4.1.6 I can download from :
http://www.readynas.com/download/RAIDiator/RAIDiator-4.1.6 is not a valid image (when I try and do a local update).

note: i also have the ftp service enabled, and it seems to work ok (albeit slowly).

Any help to resolve this soon would be greatly appreciated,
Thanks,
Jeremy