CBTab Menu display

Hi

In my CBTab Menu I have 4 sub menu :
See MyProfil, Send Private Message, Connection, and Moderate.

When I use Send Private Message, my Login Module disappear , like asssignation login module is not good. (login module is assignate to all pages)
All others sub menu no problem.

Any ideas of the problem ?
Thank you.

Module display is based off Itemid. The send private message link takes you to Uddeim, which is an entirely different component. So you need to have a Joomla menu item to UddeIM then assign the module to it (or have the module configured to display on all pages). As you already have it configured to display on all pages my only guess is maybe Template assignment and the template that's loading doesn't have the position the module is in.