What MIT server are you using.
http://ai2.appinventor.mit.edu.ezproxy.canberra.edu.au/ is up and running for use with Companion.
Building the app produces a message: The build server is currently busy. Please try again in a few minutes.
There may be a very heavy user load or MIT has a server issue.
I have the same problem 
There appear to be some networking issues related to the cluster at MIT the buildservers run on. This network issue is also affecting access to appinventor.mit.edu. ai2.appinventor.mit.edu and code.appinventor.mit.edu run on other cloud infrastructures so app creation should be unaffected (except for builds).
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Steve, your link worked...not sure what I was using before but it wasnt working. Thanks
Ah, you were using http://appinventor.mit.edu.ezproxy.canberra.edu.au (by the screenshot), which doesn't exist 
.
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That does exist and its the main overview of the App Inventor project. However, the infrastructure it typically runs on is experiencing severe disk issues at the moment. We've brought up another copy in AWS for the time being.
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