We seem to have had a spate of problems reported to Oracle Support recently whereby there have been some odd issues with session handling in EBusiness Suite 11i.    In most cases, the problem was seemingly introduced after applying an ATG RUP patchset

Personal Home Page login screen EBS

I won’t trouble you with the specifics of the problems, as it was quickly identified that the issue was only occurring when the profile option “Self Service Personal Home Page mode” (APPLICATIONS_HOME_PAGE) was set to “Personal Home Page” (PHP) rather than “Framework Only” (FWK)

Using “Personal Home Page” has not been recommended nor supported for a considerable time now, as documented in these Metalink notes:

Even if this profile option is set correctly at SITE level, it could be set incorrectly for specific users, so recommend you use the following SQL to quickly confirm that you are only using the FWK setting in all cases



REM START OF SQL
set linesize 120
set pagesize 132
column SHORT_NAME format A30
column NAME format A40
column LEVEL_SET format a15
column CONTEXT format a30
column VALUE format A60 wrap
--
select p.profile_option_name SHORT_NAME,
       n.user_profile_option_name NAME,
       to_char(v.last_update_date,'DD-MON-RR') "Last Updated",
       decode(v.level_id,
  10001, 'Site',
  10002, 'Application',
  10003, 'Responsibility',
  10004, 'User',
  10005, 'Server',
  10007, 'SERVRESP',
'UnDef') LEVEL_SET,
       decode(to_char(v.level_id),
  '10001', '',
         '10002', app.application_short_name,
         '10003', rsp.responsibility_key,
         '10005', svr.node_name,
         '10006', org.name,
         '10004', usr.user_name,
         '10007', 'Serv/resp',
                'UnDef') "CONTEXT",
      v.profile_option_value VALUE
from fnd_profile_options p,
     fnd_profile_option_values v,
     fnd_profile_options_tl n,
     fnd_user usr,
     fnd_application app,
     fnd_responsibility rsp,
     fnd_nodes svr,
     hr_operating_units org
where p.profile_option_id = v.profile_option_id (+)
and p.profile_option_name = n.profile_option_name
and n.language = 'US'
and p.profile_option_name = 'APPLICATIONS_HOME_PAGE'
and    usr.user_id (+) = v.level_value
and    rsp.application_id (+) = v.level_value_application_id
and    rsp.responsibility_id (+) = v.level_value
and    app.application_id (+) = v.level_value
and    svr.node_id (+) = v.level_value
and    org.organization_id (+) = v.level_value
order by short_name, level_set;
REM END OF SQL

If you do find anyone still using “Personal Home Page”, my recommendation is to immediately switch to the “Framework Only” setting to ensure your environment is running a supported value and conforms to security best practice