SAP instance dies when I try to make a change to the role and save

Hello Friends

I am an ABAP and XI guy, but am working on Enterprise Portal.

I have created an IVIEW (URL) and am trying to associate it with a user and role. I have created user and then when I try to assign role by clicking on AssignROles and then select a role and try to save, it consistently kills the SAP instance (dm36939 0) and this instance turns to yellow (instead of staying green). I have to restart this again. I have installed ECC and EP on this server and ECC (ABAP programs tables etc.,) works without any problem. EP also works most of the time, but consistently fails at this point as explained above.

I am not sure if there is any specific settings I should be looking at. Any feedback will be highly appreciated.

Thanks

Ram