Orca hangs when playing internet radio with Rhythmbox

[Hermann <steppenwolf2 onlinehome de>]

Hi again,
there's always something new:
This evening i tested the Rhythmbox music player. Playing files in the 
library and podcasts is no problem at all. But one cannot use internet 
radio together with Orca.
When I click on a station, Orca hangs and the radio won't play. When I type 
in a text terminal:
killall orca
and then switch back to the graphical display the radio immediateley 
starts. I can bring back Orca and stop the station, and I see the interface 
of Rhythmbox again.
When I kill Rhythmbox instead of Orca, the screen reader is back again.
Did anyone test Rhythmbox with Orca and internet radio? Is there any 
alternative program for listening internet radio?
Regards
Hermann