What I do is, plug my ipod touch and click on start up with Rythmbox. Once the ipod is shown, I transfer files from pc to ipod, and keep an eye on ipod, it shows synchronizing, now and then. After that I create a new playlist, and I do not rename, just, drag the new files to new playlist, after files are shown in new playlist, synchronizing is shown again, after like 15 seconds or so, it's not immediate. After that I can see new playlist on ipod with music. Then I rename to whatever name on Rhythmbox and wait for another 15 seconds again and synchronizing is shown again. Go back to the ipod and there it is.