SoulseekQt download nothing when no room name appears on "Rooms" tab

Hi there!
I have experienced a problem about using SoulseekQt build 2014.11.30 currently..
Once I have had installed this new version of SoulseekQt, I found it download nothing when no room name appears on Rooms tab. It would be much appreciated if someone could let me know how can I add room names under Rooms tab? Thanks!