I completely agree! You can play 'All' under folders, but not at the root level. I was so excited when I finally saw that there was a mobile upgrade, but man, you would think they had NO QA/beta testers.
I think there is actually something wrong with the entire service, at least for mobiles. I was not able to log in with the latest update so I installed the previous version again. Now when I try to log in it just I get the nag screen telling me to be careful about cost for data transfer. No matter how many times I hit OK it just keeps nagging and nagging and nagging.