My application has one form with one component TOracleSession that is connected to my server using MTS pooling. I get Access Violation on closing my application (on unloading MTS library). I use Oracle 9.2.0.7 both client and server. My OS is Windows 2000 SP4. What am I doing wrong?

That's difficult to say. Are all sessions successfully disconnected before the MTS library is unloaded?