Hi Don,
The big green LED for the GPS will blink for up to 1 to 2 minutes, or this happens for me until it gets a lock on the satellites. Once that happens, the green LED next to the external antenna connection will go solid green, as will the tiny green LED on the discovery board.
When using the ST Utility, when you flash the firmware, there is a checkbox that says "restart board after flashing", or something to that effect. Make sure that box is checked, otherwise it will not hold the update. Hope that made sense.
The big red LED on the discovery board does blink continuously while it has power. This LED does blink red/green when connected to the USB on the computer for the utility.
My detector is plugged into an 8 port switch, just as an FYI. I also run Windows 7 Ultimate 64bit and have had zero issues. One thing I DO is I first plug the discovery board into the USB port on the computer and let it recognize it. Once that happens, I start the utility. After I am finished flashing, I click File, Exit" in the utility to close it. Then I right click on the USB connection in the taskbar and tell the computer to "eject" the connection, THEN I uplug the USB cable from the computer.
John