Missing data when running mbrestore

1. We built a new dev server with 1.6.5
2. We backuped and restored the prod database (1.6.5) into the 1.6.5 dev server <-- new versions of mbbackup and mbrestore were used here
3. Things seems to be ok, but going over the application tests this morning we noticed that some of the user's data were not available
4. We tried to upgrade the dev server from 1.6.5 to 1.6.5.4 and then we went over the same issues we had last weekend when we upgraded the Orkut cluster to 1.6.5.4 and you helped us.
5. Once the upgrade didn't worked out, we did a new backup of the prod cluster (1.6.5) using the new mbbackup and we tried to restore (using the new mbrestore) into the already upgraded 1.6.5.4 dev server. This restore process poped an error:

/opt/membase/1.6.5.4/bin/ep_engine/management/mc_bin_client.py:128: DeprecationWarning: struct integer overflow masking is deprecated return self._mutate(memcacheConstants.CMD_ADD, key, exp, flags, 0, val) /opt/membase/1.6.5.4/bin/ep_engine/management/mc_bin_client.py:128: DeprecationWarning: 'I' format requires 0 <= number <= 4294967295 return self._mutate(memcacheConstants.CMD_ADD, key, exp, flags, 0, val)