126.96.36.199 and perhaps other versions...
Open a station at http://live365.com
Once it begins playing, click on another station's PLAY button. MPC will hang (in Vista here). Multiple processes may be shown in Task Manager.
If play is first stopped with the STOP, then another station _does_ play...or so it was in a brief test.
188.8.131.52 does not do this. Clicking on subsequent PLAY buttons simply relaunches the player, and the newly chosen station plays.