I have a 350, not a 650 - does that matter?
also, could you unpack your instructions a bit? where is the picture viewer? is it on the Sony? I'm on a PC with Windows XP if that makes a difference.
I put the pictures in the I:\database\media\images directory (where I is the drive name for my Sony Reader) - that's where the other pictures are. I see them all when I look using Windows Explorer.