When I try to log off of PL/SQL Developer from a certain Oracle instance (does not happen on other instances), the program locks up, and I have to kill the program through Task Manager. Furthermore, if I look in Enterprise Manager, the session shows as Active. This occurs on 3 different computers, and 2 different versions of PL/SQL Developer, however, it only occurs on one Oracle instance which recently had a space issue. This seems to be the only tool that I have with this issue. SQL*Plus, EM, and all other tools that connect to Oracle do not have this problem with this instance. Any ideas?