This seems to pop up as a question frequently, with different answers!
I'm running Windows 7, iTunes 126.96.36.199 and a SB M1001.
I recently updated iTunes and (I think it was at this time) stopped being able to see any playlists through the Soundbridge.
I CAN play Artists etc all ok.
Have done a Full scan and enabled the option to look for playlists through the server controls.
Any other ideas please?!!