The latest drop of Geocortex Essentials contains some quality improvements on our 2.X line.  Consult the release notes (which can be found on our Support Center alongside the download) to determine if this release contains resolutions to issues you are experiencing.

Since it is a maintenance-only release, there are no new features in 2.3.3.  It is intended to target ArcGIS Server 9.3/9.3.1 installations - our upcoming, major 3.0 release will be announced in a few days and will support ArcGIS Server 10.0.