[gamblor956]

Won't let me use Internet Explorer...even to simply view lesson plans, attachments, and discussions....even though the browser supports all of the required features.

That's a bummer, because this defeats the anywhere/anytime nature of Udacity's system if I can't log in an do a quick lesson during a free lunch hour.

[paradoxquine]

If you are using IE9 or above then you absolutely can browse the site and interact with classes (except game-dev of course, because IE9 does not support basic html5 technologies that it needs). Feel free to join our irc or post on the support forums if you think there is an issue with IE9 or above.