Some of you may have noticed that OpenSocial API calls in the sandbox have started returning 401s, regardless of whether or not you've enabled social ACLs in your gadget. We're in the process of changing a few things behind the scenes, one of which has the unfortunate side effect of breaking the ACL check. While this is straightened out, make sure to visit:
http://www.google.com/ig?force_sandbox=1 for a squeaky-clean and error-free sandbox.
Posted by Dan Holevoet, Developer Programs