OPlayer's Samba client doesn't always connect to all Windows 7 machines on my home network. It doesn't even always connect to thevsame machine consistently. In desperation, I even installed Windows 7's FTP service, made sure I could reach it from another iPad client (GoodReader), and tried connecting with. OPlayer -with no success.
Actually, that's on the iPad. I also have th eiPhone version, and it consistently connects to nothing.