Version 3.1.13 is now out today. This is a fixpack version and contains corrections to ARender version 3.1.12.
The full list of changes is available at this address.
We did not detect any critical fix that needed immediate migrations of ARender version, but when upgrading from a version 3 of ARender to another, the 3.1.13 is now the recommended one.
If you wish to install ARender 3 and do not yet have the download links/information, please contact us.