When ever I open up an editor or run a query in the query builder I get an Ora-02391 error. I never used to get this. It just started happening for no reason.
Corrupt TDA settings file.
1) Make sure Toad for Data Analysts (TDA) is closed.
2) Rename the 'Toad for Data Analysts x.x' folder, located in the C:\Documents and Settings\<User>\Application Data\Quest Software directory, to 'Toad for Data Analysts x.x OLD'. (x.x is the version of TDA)
3) Launch TDA and test for issue. Do not migrate settings if asked to.