RESOLUTION:
1. Grant 'Select Any Dictionary' to the Shareplex Database User on the Source and Target:
For 9i Databases:
GRANT SELECT ANY DICTIONARY TO SPLEX;
For 8i Databases:
GRANT SELECT_CATALOG_ROLE TO SPLEX;
OR
2. Modify the Oracle init.ora file to set the Parameter O7_DICTIONARY_ACCESSIBILITY to TRUE, then bounce database. For Oracle 9i Databases, this parameter is set to FALSE by default.
3. Run the Compare.