Synchronisation Issue detected during write operation
Internal testing has discovered an issue with Atlas writes which causes some operations to fail.
We've identified the cause and a fix is under test.
Update 2018-05-18 14:10 UTC
Our fix has proved good in most cases. We see an occasion session of Nuke locking during render, leaving a tmp file in place. We'll continue to investigate this but service is only mildly impacted.