Problem using SopCast software

Hi,

I have downloaded Sopcast software and installed it on Vista
It is not working properly. It is showing the channel list, but when i
select a channel, it is not showing any vedio. In fact the right hand screen
it is showing is just blank.
And the strange thing is it was working previously. Suddenly it stopped
working.
Somebody pls help me out as it is must for me to get Sopcast working.
If u need any inputs just ask m.
Thanks
--
Sandeep Kulkarni