For about two weeks now I haven't at all been able to see which songs I disliked.
Normally they are "greyed out" but I can still play the songs when I press on them. Now they aren't greyed out so I can't see which ones I disliked and nothing happens when I press a song that I disliked.
We've passed this on to our tech folks and they're looking into this. Make sure to click +VOTE if this happens to you.
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Also, could you let us know if this is happening just for Discover Weekly, or also for the other personalised playlists (Daily Mixes, Release Radar)?
As a workaround, you can 'unblock' the song through your desktop.