Hoping for a little Aperture help. I upgraded to 2.0 and ordered the upgrade serial number online (for my old license). I also installed the 2.1 upgrade the other day. Today I received an error message saying something to the effect "protection error, there is another copy of Aperture running on your network with the same serial number." The only other computer on my network is my wife's Mini Mac which does not even have Aperture installed. Only one copy (2.1) of Aperture was running on my computer. Should I uninstall the older version of Aperture? Why would it even care if it is not running? Any suggestions appreciated since I haven't run into this before and don't understand what it is looking for. Thanks.