We are getting a similar error using the following:
Database Server: 8.1.7.0.0 (on W2K)
Database Client: 8.1.7.0.0 (on W2K pro)
The RowId returned in C++ Builder is
*BAFAFiIKTDEwMDAwMDAwM
The RowId returned in SQL Plus is
*BAFAFiIKTDEwMDAwMDAwMv4
Is this normal behavior? (For a SQL Plus...