...
Solution: If only ICE matches are locked, then most likely it is due to this checkbox being deactivated in Project editor → General info → General info → Allow editing of ICE matches.
...
Solution: If only ICE matches are locked, then this is most likely because this checkbox has been deselected in the Project editor → General info → General info → Mark segments as locked when.
...
It is possible grant a particular user access to lock/unlock segments in the user's settings in Users → User list → (select a user) → Access rights → XTM Workbench → Segment locking rights.
...
Segments locked by an approved user
...