I will like to find a solution on my new installation.

This is what I get as dead link, new user dont seem able to reach it.

Let me know what other info you might need to help me.

I'm running Kunena aslo on my joomla site.

Thank you.

I guess that SEF is not working correctly. Please check if the menu link to uddeIM is still correct (so it has a valid ItemID), that your .htaccess is working properly and Joomla SEF in enabled.

In case it does not work disable SEF completely and check the URL (it should look like "index.php?option=com_uddeim&Itemid=125").

Im most cases the problem occurs when a 3rd party SEF is used that is not configured properly.