When cross-probing from Timing Analyzer to Floorplanner (Implemented view), Project Navigator crashes with a Windows "Fatal Error: GuiUtilities" error.
This problem has been fixed in the latest 8.2i Service Pack available at:
http://www.xilinx.com/xlnx/xil_sw_updates_home.jsp
The first service pack containing the fix is 8.2i Service Pack 2.