Hi Plaban
Previously, NWBC screen used to appear automatically when i logged in.
Do you mean:
1. You would open SAP GUI
2. You would enter your user name and password to GRC system
3. On logon NWBC would automatically open instead of SAP Easy Access Menu?
If so, is there a chance you had a "Set Start Transaction" for NWBC which is set on your account through Extras > Set Start Transaction?
In relation to NWBC HTML vs GUI - it is HTML if you go into SAPGUI and call NWBC transaction which results in opening a Web browser session for HTML. It is NWBC GUI if you open NWBC GUI instead of SAPGUI and logon.
If not the above steps, what has changed for it to suddenly stop working? What have you done differently recently on your system.
Regards
Colleen