Superuser rights problem

I've installed a brand new "Jessie" with TDE. Globally a smooth install. Now I've got a small problem with superuser rights with some programs. Until now kpackage-trinity and Gostcrypt have shown this behaviour: - if I start the program (from TDE), at some point it will ask for the password. Neither the root password nor the user password work. - if I modify the program "icon" by adding "tdesu" before the command, the password is asked first, and the program works correctly. This is no problem with gostcrypt, but with kpackage it means that I can't use "open with" with a package, I must load the package in kpackage (not a big deal, but I wish I would understand what the problem is). I did not see this problem with openSuSE, seems to be Debian related. Thierry