The current (Dec 20) jars can not load as big a project as the Google server
http://code.google.com/p/mit-cml-app-inventor/issues/detail?id=13
There is a comment that the problem may be fixed in the next release of the jars.
Till then, what we talked about in the tAIR web chat a few hours ago is splitting the big project into smaller pieces. That lets you work on your app regardless of what happens.
If you have an app that is using 4 screens, save the source as app1, app2, app3 and app4.
In app1 cut out the code for app[2-4]
see if the 4 smaller apps load in a new server.
It does not have to run, just load.
When you have parts that all load, look at each part and determine what data one part sends to another part.
Then you get the data the one part sends, put it into a text field
AND
use Activity Starter to pass the data there and back.
That lets you work on the Google App Inventor server for the next few days.
and!!!
the blocks you use with Activity Starter are pretty much the same as the blocks the new multiple screen code uses.
and
should help
Gary