We hit a bug in 10.2.0.1 related to this. BugDesc 4359111 ORA-600[17281] can occur when doing a session-switch in UPI mode. Oracle support mentioned that this happens with forms alot(we are not using forms). I can't get them to explain to me what the problem is. Anyone know? They mentioned something about session 1: opens cursor session 2: tries to close the cursor. any idea why this would happen? -- //www.freelists.org/webpage/oracle-l