Thanks Morten for your reply.
I've PM'd Yannis about this problem yesterday. He gave similar advice. I downloaded the source using https scheme after I couldn't use switch command. Still after doing that Berlios does not accept my legitimate pass.
Yannis also adviced me to change to svn+ssh mode. But I'm yet to figure out how to do that in console mode. I've tried using TortoiseSVN. But it fails to download the source in svn+ssh mode. Thus I've no option other than https.
I wrote one of Berlios Developer about this. Waiting for their reply.
I just wanted to know if anyone has faced this problem so that I get a quick reply.