This is a bugfix release of the stable branch, which updates also the Collaborilla client library and fixes some unicode issues with published metadata. If you downloaded and installed Conzilla via Java Web Start, then your installation probably has been updated already.
While maintaining the 2.1.x branch, development continues on Conzilla 2.2 which we plan to release during October. The next release will significantly improve usability.
Hannes Ebner on development and research 