I installed pl/sql developer version 6.03.893 and tried to compile a pre-existing procedure and got this oracle error message ORA-03114:not connected to ORACLE. I checked my connection to oracle and it is fine. I am able to compile the same procedure using sqlplus. I have oracle 9.2 server and have oracle 9i client. We opened a ticket with oracle and since the procedure is compiling fine with sqlplus they seem to think it a pl/sql developer issue.