Link to their support forum's topic on this:

http://help.codeschool.com/discussions/code-school/3731-try-...

I'm having the same problem. Other people are complaining about this in their support forums.

Doesn't speak too highly of Code School in general.

@tdonaghe - we have fixed all the lag issues (in less than 15m no less). So not sure 20 minutes of sub-optimal experience justifies your comment. Hope you stick around to learn more! :)

I take back my complaint. :)

I just finished the course.

Great job guys!

Nop working here either. OSX Lion, Safari + no plugins + no java + adblock just in case.

Yup, its completely dead...