When connecting to a SMB (Samba) share on Windows or Linux Mac osX has this horrible tendency to not refresh.
One quick loophole is to delete something in the folder, but well, in the end you run out of things to delete.
A little and very easy script makes it so much more easy to refresh.
You can find it here: http://www.shasam.net/archives/35/
Works like a charm for me :)