Data Tables v1.2.1 - Permission fix
v1.2.0 had an empty permissions.xml which caused the Data Tables permission group to disappear after upgrading. This release restores all 4 permission definitions (viewDataTable, addRecord, editRecord, deleteRecord).
After upgrading to v1.2.1, go to Admin CP > Groups & permissions > User group permissions, you should see the "Data table permissions" group with all 4 permissions configurable.
If you already set permissions before v1.2.0, you may need to re-configure them.