After changing the Project Target device, if I right click on a an Implementation process, I get a pop-up dialog box that says "'There are no property categories to display.'
Categories that are included in the implement design properties do not show up, but other processes properties seem ok.
This erroneous dialog message is caused by the Project Navigator project being out of sync with the expected target device family options.
Close the project and open it again to work around the issue.
The issue is resolved in SP 1 for ISE DS 10.1.