welcome to the forums.http://www.radioactive.se/livepls.m3u
is a playlist file containing a link to a fixed-length intro (an MP3 file on Radio Active's server) followed by the URL of the live audio stream. The SoundBridge can't handle this, it connects to the intro and plays it, once playback has ended it will reconnect to the same file and repeat it over and over again. This is a known limitation of the SoundBridge's firmware.
The usual workaround is to use the URL of the live audio stream (in this case http://www.radioactive.se:8090/active.mp3
). Unfortunately this stream plays in all software players I tested it with, but not on the SoundBridge.
Addendum: The station also plays on my Reciva based and Frontier Silicon based radios, so this clearly is an issue with the SoundBridge's firmware.
Bad luck, I'm afraid.