I have version 1.8.4 up and running, and have always used the plugin for different Shoutcast streams using the widget and the listen.pls in the shortcode.
All of a sudden only Chrome is able to actually play the streams. I have tried to add different pls mime types to my host, but this makes no difference. Firefox, IE, iPad (All latest versions) will not play.
http://blog.noisegate95.com. Plugin on the right as a widget.