Hi Dieter,
Make sure the userid you are login in NWBC have necessary roles in SU01.
Also in sap gui, give T-code NWBC. It will take you to browser based nwbc. Check your roles are coming there or not.
In NWBC, click on the settings in top left corner. go to personalize and uncheck "use sap menu instead of user menu" if it is checked.
If you want go to PFCG and create a zrole and add some t-codes like se38 , se80 etc for that user..
If roles are there with the user, definitely you will get those in NWBC.
Cheers,
Namsheed.