Since it sounds like GAE SDK 1.9.1 is having problems with the GWT
java sources in the objectify jar, I've promoted 4.1 a little early.
I'm confident in it.
This includes the new storage format. Please enable it - instructions
(and a big warning) are in the release notes:
https://code.google.com/p/objectify-appengine/wiki/ReleaseNotes
I highly, highly recommend that when you enable this flag, you do it
as a single-change push. Don't pile in a bunch of other changes in
your own code that you might need to revert. When you turn on this
flag, THERE IS NO GOING BACK!
Of course, if you don't use @Embed, it doesn't matter at all.
Jeff