I have the latest beta (6) installed on my ATV2 and the latest media palyer (0.7). I can browse to movies on my NAS and play movies but when I add the NAS location as a favourite to the Media menu and then try to select this menu item I get a message saying "Could not open dir (smb://MEDIA-NAS/Movies). Reason: Invalid Argument (22)".
Can you help? I have no issues with XBMC but prefer the simplicity of the media player.