Please try a new build of OraDirect .NET Data Provider version 3.50.10 available for download now.
This version includes:
- Bug with fetching BFILE fixed
 - Bug with processing warnings during fetch operation fixed
 - Bug with errors processing with DML array parameters fixed
 - Bug with VARCHAR2 output parameters in Unicode=true fixed
 - Bug with describing Oracle types with recursive links fixed
 
Core Lab development team
http://www.crlab.com/oranet