+1 for the fix. My proc table was also corrupted somehow - I was in the process of porting mail from Cos6.7 to Cos7.2.- happened between the first sync, testing and final sync.
(I was also moving Drupal sites and other mysql databases to the new server, but don't think it should have affected the sandboxed database).
Anyway I was able to fix the issue and zarafa is now content.
Paul