I had this problem about a week or 2 ago, I figured out what the problem was, I had Runescape also, in another tab. I closed that, and it worked. It has happened again, though. I don't have R.S., or any other Private Servers open at all on my computer, any help for a n00b? ;D
go to My computer> C:\ Drive> AllGoFree> Delete the Allgofree file
Then re-download it.
Then when you log in type ::lumby.
In more detail you can refere to this thread
http://www.worldscapeblitz.com/blitz/smf/index.php/topic,1119.0.html