Radio: Downvoting stopped working. Red thumbs down?

[user-removed]

As subject says, the ability to downvote a song I don't care much for stopped working just now. I Downvoted one song, worked great, then the thumbs down went red and thus not working any longer. I have certainly not over-used the feature. What is happening? Why am I forced to listen to music I don't like? I have a premium account... Not much of a premium feature if you ask me. Please shed some light on this.

Thanks