This is a bug fix release. The MTurk workflows were updated on 14-April-2016 to add error tasks and this caused a different problem. That problem is now fixed in this release.
You should recreate all MTurk workflows - here's why.
- Turker flows created prior to 14-April will lack error reporting
- Turker flows created after 14-April will have the bug fixed by this release
Better to recreate them all than to guess which ones will behave which way.