I am getting errors like the above for property 'role', 'group', and 'roleAndSubordinates' for multiple objects in my org when I attempt to deploy from Sandbox to Sandbox. Friday evening deployment went off without a hitch and this afternoon, after making some class and page changes, I get these errors and am unable to get my code moved.

Wy do I think this has something to do with Summer '11 arriving in my Sandboxes yesterday? Any idea how to fix it?