Help: Samsung -> CDRWin problems

[Sebber]

A few monthts ago my old HP 2 speed burner chashed. I have made a lot of backups using that one togheter with CDRWin 3.8.
Now I have got myself a new Samsung burner. To make it work with CDRWin, I had to install version 3.9.

I try to make backups like I used to, but they do not work.
The only difference in burnin (I can think of) is, that I burn at 4-speed on the Samsung (which is the slowest speed available). I used to burn at 1-speed.

I am sure, that it is not PS thats making trouble, since all my old backups runs perfectly.

Does anyone how to solve these problems with the Samsung - or CDRWin 3.9??