Whenever I try opening a package or procedure from the schema browser, I get a "List index out of bounds (6)" error message.
1) Close Toad
2) In your User Files folder, rename your EditorLayout_PLSQL.lay and EditorLayout_SQL.lay files to EditorLayout_PLSQL.lay.old and EditorLayout_SQL.lay.old, respectively.
3) Launch Toad and try to replicate the issue.
In versions of Toad for Oracle prior to 9.7, you can find the User Files folder in the C:\Program Files\Quest Software\Toad for Oracle directory.
In version 9.7 of Toad for Oracle, you can find the User Files folder in the C:\Documents and Settings\<User>\Application Data\Quest Software\Toad for Oracle directory.