I have a limit of 10 active sessions on my user profile when I connect. When I run several queries and if for some reason I'm forced to close out of Toad due to a frozen issues or ending the Task, apparently the connections are still active on Oracle because when creating new connections when re-opening Toad, I'll reach my limit of connections and receive the following error:
ORA-02391: exceeded simultaneous SESSIONS_PER_USER limit
Have a local DBA manually release the active sessions on the user to allow the connection or allow the sessions to expire automatically.
Enhancement Request has been submitted to Development for consideration in a future release of Toad for Data Analysts.