On Tuesday we announced the release of GemStone/S 64 version 2.3.1. This release is primarily a bugfix release for our commercial customers. The critical bugifixes are not likely to affect anyone using Seaside. For complete details please refer to the Release Notes.
New installations should always use the latest available product release, but for this particular release unless you are suffering from one of the bugs that has been fixed you can safely defer the upgrade.
2.3.1 ships with GLASS.230-dkh.176 so you should update to GLASS.230-dkh.177.