I think that is bugged, unrelated to load unfortunately. If you're interested in signing up with your Github account, try going to koding.com normally and using your github account there.
chrome doesnt allow to redirect the github login page to extension page, it makes this feature buggy with the chrome app. you can simply go to http://koding.com/Register and login with your GitHub account. Then reopen your terminal, it will be opened with your registered session.
I seem to be having some issue registering using my github account though. I suspect this is a load issue?