1. Close Toad and make sure Toad is not running,
2. Open Windows Explorer and go to : "C:\Users\ [ Windows User ]\AppData\Roaming\Quest Software\Toad for Oracle\ [Version] \ User Files "
3. Backup the folder "Toad for Oracle"
3. Go under: "C:\Users\ [ Windows User ]\AppData\Roaming\Quest Software\Toad for Oracle\ [Version] \ User Files "
4. Delete the files *.tmp
5. Open Toad.