TPT Wizard 14.0 Can't see columns when defining Job Source

Hello,
I'm connecting to an Oracle database using the ODBC DSN type.  When specifying my Job Source, I can connect to the source to see a list of tables, but when I select a table, the columns of the table do not appear.  I just get the spinning "hourglass".
I tried logging on as a "dba" type user but I got the same result.
Are there specific privileges required on the source system to be able to retrieve the column information ?
thanks