Please describe the problem:
In the Last.fm plugin, there is a button to skip to the next song. However this button does not function properly. The button will be grayed out when it is clicked however the player will not skip to the next song.

Steps to reproduce:
1. Enable the Last.FM plugin 
2. Start a music stream in the Last.FM plugin
3. Click "Next Song"


Actual results:
The "Next Song" button is grayed out but nothing else happens except that the current song keeps playing.

Expected results:
The player should skip to the next song.

Does this happen every time?
Yes.

Other information: