Hi,
Solved...
Just maintain image under the path-->/usr/sap/GED/J00/j2ee/cluster/apps/sap.com/
com.sap.security.core.logon/servlet_jsp/logon_ui_resources/root/layout
Also dont rely on NWA to change the image path. Also check if the same path is maintained in config tool ume settings.
I was facing the issue because i was changing the path through nwa only, but in config tool old path was maintained.
Regards:
Sioddhartha