Preview Toast 5 TI

Toast Preview crashes on my (Rev. A) iMac. I have a LaCie USB writer. In the ReadMe, it says nothing about USB-support (only FireWire & IDE), so at first I thought I was out of luck with this preview. Someone else however said that he could successfully burn CDs with Toast on X, using a USB-writer, so I installed it. Toast recognizes my drive, is able to display stats for the blank CDs I insert, but crashes when I try to add files/folders. :-(