I have been having this probelm for over a year. It doesn't matter which browser I use. If I click the pencil to edit a shuffle selection, there is no way for it to actually use that shuffle selection, it will keep playing the same shuffle selection from before. However, today, I gave up fiddling with it and after 5 songs it finally changed. I guess you just need to leave it playing for 15-20 minutes and it will eventually update. I wish there was a SAVE button when you change the Shuffle options, but at least I know now. The only problem is that I frequently don't play it for more than 30 minutes so the first half of that will be the wrong collection.... On a side note, the pop up showing which collection the song is rom does not work on the web version.
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