When iMPACT is programing the Atmel AT45DB642D device when attached to a Virtex-5, the software may close.
This problem has been fixed in the latest 9.1i Service Pack available at:
<http://www.xilinx.com/xlnx/xil_sw_updates_home.jsp>
The first service pack containing the fix is 9.1i Service Pack 2.