This morning (US EST) I tried playing several different tracks, and each time got the following message:
"This track can't be played right now. Please try again later."
Twelve hours later, still the same problem. I click the play icon and it switches from "play" to "pause" but then it instantly switches back to "play" but dimmed. I have closed all SoundCloud browser windows and reopened them, to no avail. I have tried both Firefox and IE, again without success.