As you have probably noticed, the website was recently upgraded because we were experiencing issues with the server.
Some parts of the website are currently not working, we will try to restore everything when time permits.
In the near future, we are going to move the forums to KDE's infrastructure, which will provide us a better service and less management worries.
Later (before releasing the beta 1.0 versions of Kdenlive), we will probably also move to KDE's bugtracker.
Thanks for your patience.