After some trial and error (ok, just error) I figured out that c089b69c3d contained something that broke my code, causing
Fatal error: Interface 'Doctrine\Common\Persistence\Proxy' not found
but the commit before that worked.
Is there any general recommendation of which version of doctrine-mongodb-odm should be used with the Symfony2 standard distribution v2.0.12?
Check your deps and deps.lock files for any version fixes on doctrine-common.
The doctrine-mongodb master branch sub-modules doctrine-common at commit fc26d10
See https://github.com/doctrine/mongodb/tree/master/lib/vendor.
Also see this question and answer for more information - Manually updating Symfony2 deps file to get Doctrine 2.2?