Hello Marco, we have about the same Problem, our Environment is Dephi5 Enterprise, TNT Unicode Edits, DOA 4.0.6, Oracle 10g R1 AL32UTF8, Client Oracle 10g , nls_lang set to GERMAN_GERMANY.WE8MSWIN1252.
German text is saved correctly, Russin Text (kyrillic) is displayed correct, but saved as...