Here's a link to a thread on the 3D Coat forum about it:
http://3d-coat.com/forum/index.php?showtopic=16112

here's the thread on CGTalk for Silo 2.3.1 release:
http://forums.cgsociety.org/showthread.php?f=175&t=1237509

and here's a link to the release notes:
http://nevercenter.com/silo/release_notes/