If you found a bug, please check if this bug have already been reported before you create a new issue on the GoogleCode project site.
JForum3 is still under development by the JForum team. The progress may be a little bit slow than what you expected. And I don't have any idea when it will be released. So if JForum3 is released someday, you need to use the new page layout(So, the only thing of JForum2 left is the database content).
What to do to upgrade to JForum3:
1.You'll need to do some database schema upgrade.
See this
mysql script for a preview.
2.You'll need to do the look-and-feel HTML page UI customization again.
3.You'll need to check all your old data working correctly with the new software.