Toad is not showing large numbers correctly. If a table contains a field with 18 digits, Toad will display the column incorrectly. It looks as it's unable to show the last digits and rounds up the last 3 or 4 digits.
The option "Display large numbers in Scientific Notation" is unchecked and does not make a difference.
Toad shows the number 370376107006312000 in the first record, but the actual number inserted is 370376107006311599.
Issue fixed in version 9.0.1. The latest version of Toad for Oracle can be downloaded at: http://support.quest.com/support_download/Downloads.asp