Description
1. Go to any old groups pre Syntax 2.1 release.
2. Edit the Welcome block
3. Then save.
Bug
Your changes are not saved and in some cases your changes are lost.
Compare this old one:
http://www.curriki.org/xwiki/bin/view/Group_SmartBoxDesign/WebHome
to this new one.
http://www.curriki.org/xwiki/bin/view/Group_TestingWelcomeBlock/WebHome
I tested on Chrome and Safari.